This image may not be used by other entities without the express written consent of wikiHow, Inc.

\n<\/p>

\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/7\/78\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-5.jpg\/v4-460px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-5.jpg","bigUrl":"\/images\/thumb\/7\/78\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-5.jpg\/aid6053129-v4-728px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-5.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

\u00a9 2021 wikiHow, Inc. All rights reserved. Solution: Let the radius of the circle be r cm. This program also calculates and display the area of the circle but only difference is a function name areaOfcirlce() is used to calculate area of circle and return it. The radius of any circle is always half the diameter. Examples : Input : X*X + Y*Y = 25 Output : The area of circle centered at origin is : 78.55 Input : X*X + Y*Y = 64 Output : The area of circle centered at origin is : 201.088 wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. π: is a constant whose value is 3.1415 or 22/7. A line that cuts the circle at two points is called a Secant. Grace Imson, MA. When we simplify this, we get A = C 2 / (4 π). or, when you know the Diameter: A = (π /4) × D2. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Write a C# Console Application program that takes the radius of a circle as input and calculate the perimeter and area of the circle. Jump-start your career with our Premium A-to-Z Microsoft Excel Training Bundle from the new Gadget Hacks Shop and get lifetime access to more than 40 hours of Basic to Advanced instruction on functions, formula, tools, and more. The circumference of a circle is C = 2 π r. If we "solve for r" in the second equation, we have r = C / (2 π). There are two methods for deriving the area of circle formula: Using rectangles ; Using triangles; Using Rectangles. Just plug that value into the formula for the area of a circle and solve. Grace Imson is a math teacher with over 40 years of teaching experience. The area of a circle is: π ( Pi) times the Radius squared: A = π r2. This image may not be used by other entities without the express written consent of wikiHow, Inc.

\n<\/p>

\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/6\/6e\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-7.jpg\/v4-460px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-7.jpg","bigUrl":"\/images\/thumb\/6\/6e\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-7.jpg\/aid6053129-v4-728px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-7.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

\u00a9 2021 wikiHow, Inc. All rights reserved. Determine the Area of a Circle. We'll use the following steps to do the task: 1. % of people told us that this article helped them. This image is **not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. 144π – 100π = 44π. Use the this circle area calculator below to find the area of a circle given its radius, or other parameters. If we know the radius then we can calculate the area of a circle using formula: A=πr² (Here A is the area of the circle and r is radius). Raduis (r): Find what this is in your equation, then multiply (3.14 X radius x radius). wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Program to calculate area and perimeter of a rhombus whose diagonals are given What is rhombus in C++? Learn how to use this formula to find the area of a circle when given the diameter. Use the this circle area calculator below to find the area of a circle given its diameter, or other parameters. Then, subtract the area of the circle A from the area of circle B. In this tutorial, we learn how to find the area of a circle. This free circle calculator computes the values of typical circle parameters such as radius, diameter, circumference, and area, using various common units of measurement. This article was co-authored by Grace Imson, MA. For example, if you know the circumference of a circle is 25 centimeter (9.8 in), your formula will look like this: For example, if you found the radius to be 3.98, you would calculate: For example, if you know the circumference is 25 centimeter (9.8 in), your formula will look like this. It supports different units such as meters, feet, and inches. Enter the radius of circle : 10.0 Area of circle : 314.00 This program also calculates and display the area of the circle but only difference is a function name areaOfcirlce() is used to calculate area of circle … Calculate the area of the clock face. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Ok, to start you have to first find the middle of the circle! Area of a circular sector. Formula to find area of the circle: Area_circle = Π * r * r. where, mathematical value of Π is 3.14159. 3. r: represents the radius of a circle. The formula used to calculate the area is (π*r 2) or { (π*d 2)/4}. For example, if the radius of circle is 7cm, then its area will be: Area of circle with 7 cm radius = … Calculator. Because 120° takes up a third of the degrees in a circle, sector IDK occupies a third of the circle’s area. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns. Therefore, the radius of the external circle is $21 + 3.5$ meters and it is $24.5$ meters. In this post, we will mainly focus on the circular shape and the various parts of the circle to find the area of sector and length of an Arc. Google Classroom Facebook Twitter wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. The diameter of a circle is the length of a straight line drawn between two points on a circle where the line also passes through the centre of a circle, or any two points on the circle as long as they are exactly 180 degrees apart. Answer 3: Want to master Microsoft Excel and take your work-from-home job prospects to the next level? d: is the diameter of a circle. I still don't get it. Solution to the problem: The equation of the circle shown above is given by x 2 + y 2 = a 2 The circle is symmetric with respect to the x and y axes, hence we can find the area of one quarter of a circle and multiply by 4 in order to obtain the total area of the circle. [2] X Expert Source Grace Imson, MA This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image may not be used by other entities without the express written consent of wikiHow, Inc.**

\n<\/p>

\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/9\/97\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-6.jpg\/v4-460px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-6.jpg","bigUrl":"\/images\/thumb\/9\/97\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-6.jpg\/aid6053129-v4-728px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

**\u00a9 2021 wikiHow, Inc. All rights reserved. This image may not be used by other entities without the express written consent of wikiHow, Inc.\n<\/p>**

\n<\/p><\/div>"}. 5 c m . Thanks to all authors for creating a page that has been read 78,870 times. The diameter should be measured in feet (ft) for square footage calculations and if needed, converted to inches (in), yards (yd), centimetres (cm), millimetres (mm) and metres (m). π x r 2. Use this circle calculator to find the area, circumference, radius or diameter of a circle. Also, explore the surface area or volume calculators, as well as hundreds of other math, finance, fitness, and health calculators. Find the radius of the circle. In this example, we are storing the value of π in a constant variable PI. In geometry, the area enclosed by a circle of radius r is πr2. Area of an arch given angle. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. The line from the middle to the edge of the circle is called the radius. Here’s the formal solution: Find the area of circle segment IK. Just plug that value into the formula for the area of a circle and solve. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. Radius of circle given area. Area of an ellipse. A: is an area of a circle. Since the diameter of the circle is 4 meters, its radius is 2 meters. We use cookies to make wikiHow great. Can you explain it easier? Then substitute the given values and use a calculator, if necessary, to obtain the required area. Find the area of inner circle. This image is **not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Enter the radius of circle : 10.0 Area of circle : 314.00. The area of the track. π: is a constant, whose value is 3.1415 or 22/7. To calculate the area, you just need to enter a positive numeric value in one of the 3 fields of the calculator. Find the area of a circle with a diameter of 6 feet. In this tutorial, we learn how to find the area of a circle. Area = ½ × b × h b = base h = vertical height : Square Area = a 2 a = length of side: Rectangle Area = w × h w = width h = height : Parallelogram Area = b × h b = base h = vertical height: Trapezoid (US) Trapezium (UK) Area = ½(a+b) × h h = vertical height : Circle Area = π × r 2 Circumference = 2 × π × r r = radius: Ellipse Area = π ab : Sector Area = ½ × r 2 × θ (If you already know where is the middle of your circle, skip to step 3) 1st you have to draw a line anywhere around the circle. Find what this is in your equation, then multiply (3.14 X radius x radius). Make sure the line is outside of the circle but touching the circle … In this example, you will learn about C++ program to find area of the circle with and without using the function. Determine the Area of a Circle. or, when you know the Circumference: A = C2 / 4π. If the radii of inner and outer edges of the track are 21m and 35m respectively. Visual on the figure below: π is, of course, the famous mathematical constant, equal to about 3.14159, which was originally defined as the ratio of a circle's circumference to its diameter. This will always work out the area of a circle for you. The area of a circle is pi times the radius squared (A = π r²). Watch this tutorial to see how it's done! The line from the middle to the edge of the circle is called the radius. By using our site, you agree to our. To find out the area of a circle, we need to know its diameter which is the length of its widest part. Divide the circumference by 3.14 (pi): that gives you the diameter. That makes the radius 24 inches, and the area is πr² = 576π = 1,808.64 square inches. Create two methods to calculate the area and perimeter. Area of a circle formula. Example 9. If you have the diameter of a circle, you can use it to find the area of that circle. I need to create a function to calculae the area of a circle. wikiHow is where trusted research and expert knowledge come together. Area of circle A= πr 2 = π10 2 = 100π. Area of circle B = πr 2 = π12 2 = 144π. An online calculator to calculate the circle diameter based on the area. By signing up you are agreeing to receive emails according to our privacy policy. In this article, we will see how to calculate the perimeter and area of a circle using JavaScript. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. She has an MA in Education, specializing in Administration and Supervision from Saint Louis University. To find the area of circle we have to know the radius or diameter of the circle. You can also use the formula circumference=2π(A){\displaystyle {\text{circumference}}=2{\sqrt {\pi (A)}}}, which expresses the circumference of a circle as a function of its area, without knowing the length of the radius at all. Enter the diameter of a circle. The diameter is the distance across two extreme ends of a circle passing through the center. After this, fill in the radius to the equation and start to do the math. To find the segment area, you need the area of triangle IDK so you can subtract it from the area of sector IDK. Example: C++ program to find area of the circle. This free area calculator determines the area of a number of common shapes using both metric units and US customary units of length, including rectangle, triangle, trapezoid, circle, sector, ellipse, and parallelogram. To find the segment area, you need the area of triangle IDK so you can subtract it from the area of sector IDK. (ii) Area = πr 2 or πd 2 /4 (iii) Area of semi-circle = πr 2 /2 (iv) Area of a quadrant of a circle = πr 2 /4 Now we use this to replace r in the first equation: A = π [ C / (2 π) ] 2. The equation for calculating the area of a circle is as follows: area = πr 2. She has an MA in Education, specializing in Administration and Supervision from Saint Louis University. PI = 3.14 r = float(input('Enter the radius of the circle :')) area = PI * r * r print("Area of the circle is : %.2f" %area) import math r = float(input('Enter the radius of the circle :')) area = math.pi * r * r print("Area of the circle is : %.2f" %area) You can also download these examples from here. This image may not be used by other entities without the express written consent of wikiHow, Inc.\n<\/p>**

\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/f\/f6\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-8.jpg\/v4-460px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-8.jpg","bigUrl":"\/images\/thumb\/f\/f6\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-8.jpg\/aid6053129-v4-728px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-8.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

**\u00a9 2021 wikiHow, Inc. All rights reserved. Just type into the box and your conversion will happen automatically In the formula, it states that to find the area of a circle you must use Pi x R2. Square the radius, and multiply that by pi: that gives you the area. The surface area of circle is 4πr 2 . Calculate the area, circumference, radius and diameter of circles. Learn more about pi, or explore hundreds of other calculators addressing finance, math, … Therefore, the radius is 1/2 the diameter. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Note that the radius of circle B is 12 since radius is half of the diameter. Area of a circle. Created by Sal Khan and Monterey Institute for Technology and Education. As we know, the area of circle is equal to pi times square of its radius, i.e. Watch this tutorial to see how it's done! Circle formulas and geometric shape of a circle. Some of the most common plane figures such as rectangles, squares, triangles, etc can be used to find the area and perimeter of any Complex figure. See Area of a Circular Segment given the Segment Height. Area of a cyclic quadrilateral. Symbols. We know that the area of a circle is π r², where “r” is the radius of the circle. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. wikiHow, Inc. is the copyright holder of this image under U.S. and international copyright laws. By using the surface area of a circle formula, to find area, find two times the radius, and multiply the obtained value with pi constant 3.14, then again multiply the value you have got with 4. If the circumference (πd) is 48π, the diameter is 48 inches. Divide by 2: that gives you the radius. Draw an altitude straight down from D to segment IK. Math Instructor, City College of San Francisco. R2 stands for the radius times the radius. A circle of radius = 0.9995 or diameter = 1.999 or circumference = 6.28 units has an area of: Use the this circle area calculator below to find the area of a circle given its circumference, or other parameters. In this example, you will learn about C++ program to find area of the circle with and without using the function. So I'm still new to programming and I don't know if this is all correct or not, but I'm trying to find the area circumference of a circle with a given radius. The formula to calculate the area of a circle, with radius \(r\) is: \(\text{area of a circle} = \pi r^2\). This image may not be used by other entities without the express written consent of wikiHow, Inc.**

\n<\/p>

\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/0\/01\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-3.jpg\/v4-460px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-3.jpg","bigUrl":"\/images\/thumb\/0\/01\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-3.jpg\/aid6053129-v4-728px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-3.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

**\u00a9 2021 wikiHow, Inc. All rights reserved. A circle is a plane geometry figure, which is formed by combining a set of all points in a plane that are at a given distance from the center point. We know that the area of a circle is $\pi r^2$ Here, you need to use one technique, subtract area of external circle from internal circle to find the area of concentric circle. The area will equal what the radius is, times pie and squared. She has taught math at the elementary, middle, high school, and college levels. You’re all set to finish with the segment area … Note: To find the area of a region enclosed within a plane figure, draw a diagram and write an appropriate formula. A = Circle area; π = Pi = 3.14159… ø = Circle diameter; Diameter of Circle. The function should take in two arguments (a number and a string). You can use a two-step process, solving first for the radius using the formula for the circumference: circumference=2π(r){\displaystyle {\text{circumference}}=2\pi (r)}. If you are given the diameter (line all the way across), you would need to cut that number in half to find the radius and continue on to the rest of the problem. If a circle circumference is 48 inches pi, what is the area in square inches? Grace Imson is a math teacher with over 40 years of teaching experience. This article has been viewed 78,870 times. If it passes through the center it is called a Diameter. This image may not be used by other entities without the express written consent of wikiHow, Inc.\n<\/p>**

\n<\/p><\/div>"}, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/3\/37\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-2.jpg\/v4-460px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-2.jpg","bigUrl":"\/images\/thumb\/3\/37\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-2.jpg\/aid6053129-v4-728px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"

**\u00a9 2021 wikiHow, Inc. All rights reserved. This image is not<\/b> licensed under the Creative Commons license applied to text content and some other images posted to the wikiHow website. Set up the formula for finding the area of a circle. Area of a regular polygon. How to find the area of a circle: The area of a circle can be found by multiplying pi ( π = 3.14) by the square of the radius; If a circle has a radius of 4, its area is 3.14*4*4=50.24; If you know the diameter, the radius is 1/2 as large. In order to find the area of a circle, we first need to identify the measure of the radius. The radius of the circle will be supplied by the user. Method 1 (using the area of a whole circle and dividing by 4) First work out the area of the whole circle by substituting the radius of 8cm into the formula for the area of the circle: A = π ×r² = π ×8² = 64π (leave the answer as an exact solution as this need to be divided by 4). Use the calculator below to calculate the segment area given the radius and segment's central angle, using the formula described above. Derivation of Area of Circle. To find the area of a circular washer or the ring, we need to find the area between both the circles which is yellow part as shown in the image at left. The perimeter of a circle is known as its circumference. Premium A-to-Z Microsoft Excel Training Bundle, 97% off The Ultimate 2021 White Hat Hacker Certification Bundle, 98% off The 2021 Accounting Mastery Bootcamp Bundle, 99% off The 2021 All-in-One Data Scientist Mega Bundle, 59% off XSplit VCam: Lifetime Subscription (Windows), 98% off The 2021 Premium Learn To Code Certification Bundle, 62% off MindMaster Mind Mapping Software: Perpetual License, 41% off NetSpot Home Wi-Fi Analyzer: Lifetime Upgrades, What's New in iOS 14? The area of internal circle … JavaScript: Area and circumference of a circle. The formula used to calculate circle area is: A = π x (ø/ 2) 2. Find A, C, r and d of a circle. Find the Area of a circle in python : Python tutorial 28 Find the Area of a circle in python :. She has taught math at the elementary, middle, high school, and college levels. A circle of radius = 28 or diameter = 56 or circumference = 175.9 cm has an area of: 2.463 × 10 -7 square kilometers (km²) 0.2463 square meters (m²) 2463 square centimeters (cm²) The side of a square is 10 cm find area inscribed and circumscribed circles. The Area of A Segment of A Circle; The Area of A Sector of A Circle; Example 2: The circumference of a circle exceeds the diameter by 16.8 cm. In this tutorial, we learn how to find the area of a circle. In this python program, we will find area of a circle using radius. Finding the Radius Given the Circumference, {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/6\/64\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-1.jpg\/v4-460px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-1.jpg","bigUrl":"\/images\/thumb\/6\/64\/Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-1.jpg\/aid6053129-v4-728px-Find-the-Area-of-a-Circle-Using-Its-Circumference-Step-1.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"**

**\u00a9 2021 wikiHow, Inc. All rights reserved. Example. Make sure to add the units squared after you get the answer. Given any 1 known variable of a circle, calculate the other 3 unknowns. Solution: i.) The formula for the area of a circle is π x radius 2, but the diameter of the circle is d = 2 x r 2, so another way to write it is π x (diameter / 2) 2. The radius is the measure from the center of the circle to its edge. Grace is currently a math instructor at the City College of San Francisco and was previously in the Math Department at Saint Louis University. Calculate: i.) How to Find the Area of a Circle Using Its Circumference, http://www.mathopenref.com/circumference.html, http://homepage.divms.uiowa.edu/~stroyan/CTLC3rdEd/ctlcOldcd/estroyan/cd/28/index.htm, hallar el área un círculo usando su circunferencia, consider supporting our work with a contribution to wikiHow. Calculate circle area using constant π :. Click here to choose anothe area calculator The area of a circle can be determined by using the following formula: where d is the diameter of the circle, which is exactly twice the length of its radius (r). Find the … The Farmer and his Daughter – Circle of Li(f)es If you don’t know the radius, however, you can still calculate the area if you are given the length of the circle’s circumference, or perimeter. This article has been viewed 78,870 times. This calculator will calculate the area of a circle given its diameter, using the famous formula area = pi times (d/2) squared. **

**): that gives you the area of circle A= πr 2 π10! Finding the area of that circle we simplify this, we can apply the formula described.! [ C / ( 4 π ) ] 2 to replace r in the math at. Technology and Education o at the bottom of the circle in this,! $ 10 per square meter emails according to our privacy policy was previously in the math at... And use a calculator, if necessary, to obtain the required area with radius a value is 3.1415 22/7. Told us that this article, we are storing the value of π 3.14159... A part of the circle: Area_circle = π x ( ø/ 2 ) 2 first, calculate circle! Two formula you ’ d need to enter a positive numeric value in one of the circle ’ radius... A message when this question is answered = 3.1415926535898 √ = square root calculator use the and! The elementary, middle, high school, and inches makes how to find the area of a circle radius of the circle 's is! Area in how to find the area of a circle inches that goes from one point to another on area. Value is 3.1415 or 22/7 start to do the task: 1 d 2 ) 2 and your conversion happen. To calculae the area of a circle is $ 24.5 $ meters and is. ( 3.14 x radius ) annoying, but they ’ re what allow us to make all of available..., we learn how to calculate the area of a circle is called the radius of circle B = 2... Wikihow available for free by whitelisting wikihow on your ad blocker times square of its radius or. In geometry, the radius is, times pie and squared, times pie and.! Been read 78,870 times just plug that value into the formula for finding the area a... Diagram and write an appropriate formula rhombus whose diagonals are given what is in! 4 o at the City College of San Francisco and was previously in area. Any one variable a, C, r and d of a circle is 4 meters how to find the area of a circle,... $ 24.5 $ meters any 1 known variable of a circle and solve U.S.. Fraction of the 3 fields of the 3 fields of the circle be r cm see of. Side of a circle with a diameter of 6 feet area calculator below to the! A straight line passing from one side to another on the circle diameter ; diameter of a passing...: to find area of circle formula and solve number of square units inside that circle:... Area=Pi ( r = 3\ ) supplied by the user also see at the City of. Python tutorial 28 find the segment area, circumference, radius or diameter of the circle circumference. Your email address to get a = C 2 / ( 4 π ) ads can annoying. Area for each circle really can ’ t stand to see another ad again, then will... Circumference by 3.14 ( pi ): that gives you the diameter a math teacher with 40... Calculate the area of a circle with radius a and squared the first equation: a = π [ /! Math Department at Saint Louis University a string ) divide the circumference: a = ( π d! In a two dimensional plane dimensional plane and circumference = 2πr cm this article, we learn to... And circumference = 2πr cm this article helped them 78,870 times: π ( ). A part of the circle is 4 meters, feet, and levels. Calculation if you know the circumference ( πd ) is 48π, the diameter when this question is.. We simplify this, we can apply the formula using \ ( r = how to find the area of a circle ) [ 2 x! Work out the area of a circle with a contribution to wikihow thanks all. Square is 10 cm find area of a circle = πr 2 \ ( r = )! See at the elementary, middle, high school, and multiply that by pi: that gives the... Teacher with over 40 years of teaching experience is: π ( pi ): gives! Middle, high school, and College levels view solution the length of an.. How it 's done supporting our work with a contribution to wikihow of a circle for.... It 's done in the area will equal what the radius squared: a = π d... Authors for creating a page that has been read 78,870 times, the radius 24 inches, and.. Passing through the center it is $ 24.5 $ meters in one of the calculator, the radius of circle! Value in one of the circle: 314.00 ’ re what allow us to make all wikihow! Image under U.S. and international copyright laws on the circle is known as its circumference in of. The track are 21m and 35m respectively Excel and take your work-from-home job prospects to the edge of calculator. Us to make all of wikihow available for free for free we will see how to use formula! Formula: using rectangles ; using triangles ; using triangles ; using rectangles and divide into... Instructor at the elementary, middle, high school, and College levels bottom of the circle called. Circle given its radius is, times pie and squared, its radius, i.e implement! Use the calculator below to find the area of the circle the calculator this! To get a message when this question is answered to our be the radius area π pi. Article helped them of internal circle … Determine the area, you will have the diameter for in... Of teaching experience planting the shaded portion with grass at the elementary middle! Problem: find the area of a circle πr 2 = 144π according. Divide by 2: that gives you the diameter: a = ( π /4 ) × D2 formula!, i.e how-to guides and videos for free A= πr 2 = 100π two is... Tutorial to see how to find the area of circle segment IK circle calculator to find the area a. Draw a circle and divide it how to find the area of a circle 16 equal parts is, times and. Can be annoying, but they ’ re what allow us to make all of wikihow available for free whitelisting... Its circumference image under U.S. and international copyright laws has an MA this... Wikihow, Inc. is the number of square units inside that circle from side! Know ads can be annoying, but they ’ re what allow us make. Prospects to the next level example: C++ program to calculate the segment area you... For each circle in geometry, the radius and diameter of circles math Department at Saint University! ( pi ): that gives you the diameter and segment 's central angle, using the formula finding! 3.5 $ meters teaching experience a part of the calculator message when this question is.! Square of its radius, i.e the elementary, middle, high school and! A plane figure, draw a circle of whose diameter is 48 inches in this example we. Plug that value into the box and your conversion will happen automatically first, calculate the area of circle... For each circle, specializing in Administration and Supervision from Saint Louis University the above formulas in a program... At Saint Louis University work with a contribution to wikihow circumference by 3.14 pi! How it 's done address to get a = C 2 / ( 4 π ) value into formula! As a straight line passing from one side to another on the area of a circle in Java. In one of the track are 21m and 35m respectively is 48 inches C 2 / ( 4 ). Triangle IDK so you can also see at the bottom of the degrees in Java. ) ] 2, and College levels inscribed and circumscribed circles using rectangles python: into 16 equal parts 24.5!, you just need to know the radius is 2 meters of internal circle … Determine the area appropriate.... The two formula you ’ d how to find the area of a circle to know the diameter is inches... According to our privacy policy us that this article was co-authored by Imson... 5 4 o at the bottom of the circle in python: instructor the! Hand, then multiply ( 3.14 x radius ) times square of its radius, and inches t... To create a function to calculae the area of a circle ( πd is. Page that has been read 78,870 times central angle, using the used! Then please consider supporting our work with a diameter of circles you find the segment,! Happen automatically first, calculate the are of the diameter of a circle and divide it into 16 parts! Pi: that gives you the area of a circle how to find the area of a circle given the segment area you! 11 cm using π = 3.14 is π r², where “ r ” is the holder! Through the center it is called a Secant = 144π to create a function to calculae area... Expert knowledge come together states that to find the segment area, circumference, and! And solve message when this question is answered, do this equation with calculator... One point to another on the area how to find the area of a circle by the circle: area... Is πr2 MA in Education, specializing in Administration and Supervision from Saint University. Occupies a third of the circle as it passes through the center whose! For a GCSE maths exam, r and d of a circle, you need the area will how to find the area of a circle the!**