how to find the area of a circle

How? Now once we get the radius, try to find the sector of the circle for which the given arc is the boundary Then find the angle subtended by this arc at the center of the circle Thus, the circumference of the circle is 44 cm. Thanks to all authors for creating a page that has been read 5,217,159 times. BlueJ (area of circle) BlueJ (area of circle) How does one write a program to calculate the area of a circle in BlueJ? Answer: The formula of arc length is L = r × Θ. Here a three ways to find the area of a circle (formulas): Circle area formula in terms of radius. If you want to report a numerical value, you can multiply 120 x 3.14 to get a value of 376.8 cm. \ (\pi r^2\) means \ (\pi \times r \times r\). The radius is the straight-line distance from the centre of a circle to the edge of the circle. Welcome to How to Find the Area of a Circle with Mr. J! Using a Formula Given the Circumference 1. The area is a quantity that represents the extent of the figure in two dimensions. (If you're asking how to convert from square inches to square feet, divide the number of square inches by 144 to get square feet.). Therefore, here we can find the value of radius, How do I find the total area of five circles joined together? You can find diameter of a circle by multiplying the radius of a circle by two: Example: C++ program to find area of the circle. Below is the required implementation: filter_none. Grace is currently a math instructor at the City College of San Francisco and was previously in the Math Department at Saint Louis University. If you really can’t stand to see another ad again, then please consider supporting our work with a contribution to wikiHow. r = C/2π In this article, let us discuss in detail about the area of a circle, surface area and its circumference with examples. Area of Circle = πr2 or πd2/4, (square unit) where π = 22/7 or 3.14 You can also see at the bottom of the calculator, the step-by-step solution. Program to calculate area of inner circle which passes through center of outer circle and touches its circumference. When it comes to circles, the perimeter is given in a different name. D in the formula refers to the diameter which is the width of the circle. You convert inches to feet the same way to find the area of a circle as you do to find anything else. 08, Jan 20. The circumference of a circle is the linear distance around its edge. 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. She has taught math at the elementary, middle, high school, and college levels. Thank you so much! Last Updated: December 27, 2020 So the area covered by one complete cycle of the radius of the circle on a two-dimensional plane is the area of that circle. Since a circle is a, Frequently Asked Questions Using Area of Circle Formula. 4 and spreading the lines, the result will be a triangle. The area of a circle is the area covered by the circle in a two dimensional plane. ", "I was looking for different ways to find the area of a circle and this really helped!!! 3. "Thank you very much for this amazing page and for everything. In real life, you will get many examples of the circle such as a wheel, pizzas, a circular ground, etc. The mathematical formula for calculating the perimeter and area of the circle is given below: Area of circle = π * r * r Perimeter of circle = 2 * π * r Both formulae require the value of PI. The user provides an option and the switch statement executes the corresponding case. To find the area using the radius, or the length from the center of the circle to the edge, use the formula area = πr^2, where r is the radius. ", "Thx for this article. ", but after this, I don't just know it, I understand it! How do I convert the area of a circle in cm to area of a circle in meters? In this example we will calculate area and circumference of the circle according to given radius. For example, if the radius of the circle is 6 inches, first you would square 6 and get 36. The diameter of the circle is the line which divides the circle into two equal parts. Program to calculate area of an Circle inscribed in a Square. 18, Jul 18. The radius of the circle is the line which joins the centre of the circle to the outer boundary. Here’s the formal solution: Find the area of circle segment IK. Therefore, the sample circle with a diameter of 20 inches will have a radius of 20/2, or 10 inches. As we found the value of r, now we can find the area; Subscribe to our BYJU’S YouTube channel to learn even the most difficult concepts in easy ways or visit our site to learn from wonderful animations and interactive videos. By using our site, you agree to our. Consider a circle with radius ‘r’ and circumference ‘C’. edit close. Then the area for this circle, A, is equal to the product of pi and square of the radius. For this sample circle, with a circumference given as 42 cm, the area is. 1, with centre at O and radius r. The perimeter of the circle is equal to the length of its boundary. Your email address will not be published. Also, if we know the circumference of the circle, then we can find the area of circle. Therefore, the radius of the external circle is $21 + 3.5$ meters and it is $24.5$ meters. It is called the “Circumference” of the circle. ", "I didn't know how to do it at all and now I understand a little/lot more. I was able to finish my assignment. Moreover, i f the radius of Circle is 5.0, then the Area of Circle will be 78.525. However, you also need to practice converting some other bits of provided data into terms that can help you use this formula. For example: If d= 23cm, C= 3.14 x 23cm, so C= 72.22cm. In the above figure, we can see a circle, where radius r from the centre ‘o’ to the boundary of the circle. ", "I think this really helped me. This article was co-authored by Grace Imson, MA. She has an MA in Education, specializing in Administration and Supervision from Saint Louis University. Calculate the areas, and divide the total area of the box by the area taken up by one chick. % of people told us that this article helped them. It is given by; Here, the value of pi, π = 22/7 or 3.14 and r is the radius. The circle is divided into 16 equal sectors, and the sectors are arranged as shown in the fig. The area of a circle is: π ( Pi) times the Radius squared: A = π r2. Plug the circumference into the formula. We have. The base of the triangle will be equal to the circumference of the circle, and its height will be equal to the radius of the circle. The surface is represented in square units. The sum of the small angle and the great angle will be 360 degrees. This circumference is the length of the boundary of the circle. The answer is “No”. ", "This is so helpful, I feel I can go and master my exam. Grace Imson is a math teacher with over 40 years of teaching experience. Therefore, the area of the circle is 113.04 inches squared. It can be difficult to measure to the exact center of a circle, unless the center is already marked for you on a circle drawn on paper. If the pipe was made after WWII, try a comparison. To find out the area of a circle, we need to know its diameter which is the length of its widest part. C = pi * d calculates the circumference (distance around the outside of the circle). ", "I only had a slim clue on how to calculate the area of a circle, and this helped me fully understand. play_arrow. Include your email address to get a message when this question is answered. ", "This article will help me pass the math exams for getting a score in school. Now how can we calculate the area for any circular object or space? Find a pipe of the same material and exterior dimensions, and measure its interior. Calculator. Steps to be followed to find the Area of A Sector in a circle (formula) : Firstly, try to find the radius of the circle. Given the radius of a circle and the task is to find the area and perimeter of the circle. How do I calculate the circumference of a circle? ", "I love that it shows you different ways. wikiHow is where trusted research and expert knowledge come together. The formulas for a circle’s segment are as follows: Area of a Segment of a Circle Formula. The length of rope which wraps around its boundary perfectly will be equal to its circumference, which can be measured by using the formula: π, read as ‘pi’ is defined as the ratio of the circumference of a circle to its diameter. wikiHow helps with its clear instructions and explanations, even on depressing afternoons where nothing math-related seems to be going right. {"smallUrl":"https:\/\/www.wikihow.com\/images\/thumb\/6\/65\/Calculate-the-Area-of-a-Circle-Step-1-Version-6.jpg\/v4-460px-Calculate-the-Area-of-a-Circle-Step-1-Version-6.jpg","bigUrl":"\/images\/thumb\/6\/65\/Calculate-the-Area-of-a-Circle-Step-1-Version-6.jpg\/aid53808-v4-728px-Calculate-the-Area-of-a-Circle-Step-1-Version-6.jpg","smallWidth":460,"smallHeight":345,"bigWidth":728,"bigHeight":546,"licensing":"