Download Article Show Download Article The radius of a circle is the distance from the center of the circle to any point on its circumference.[1] The easiest way to find the radius is by dividing the diameter in half. If you don’t know the diameter but you know other measurements, such as the circle’s circumference () or area (), you can still find the radius by using the formulas and isolating the variable.
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Advertisement About This ArticleArticle SummaryX To calculate the radius of a circle by using the circumference, take the circumference of the circle and divide it by 2 times π. For a circle with a circumference of 15, you would divide 15 by 2 times 3.14 and round the decimal point to your answer of approximately 2.39. Be sure to include the units in your answer. To learn more, such as how to calculate the radius with the area or diameter, keep reading the article! Did this summary help you? Thanks to all authors for creating a page that has been read 3,224,109 times. Did this article help you?How do you find the radius of a circle with coordinates?Explanation: The formula for the equation of a circle is (x – h)2+ (y – k)2 = r2, where (h, k) represents the coordinates of the center of the circle, and r represents the radius of the circle.
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