![]() To represent a circle on the Cartesian plane, we require the equation of the circle. This equation is used across many problems of circles in coordinate geometry. The equation of a circle is different from the formulas that are used to calculate the area or the circumference of a circle. The equation of circle provides an algebraic way to describe a circle, given the center and the length of the radius of a circle. We also have a fun instructional video on diameter, radius and circumference of a circle right here: Circumference of a Circle Video. Our circumference calculator is free to use any time you want to determine the circumference of a circle! Our circumference calculator provides circumference of a circle by entering its radius. This is because it uses a more accurate number for Pi, rather than rounding to 3.14. When you enter the radius of 24 into our calculator, it provides you with an answer of 150.79644737231007, which is a more precise answer. What is the circumference of a circle whose radius is 24 inches? This means that any circle’s circumference will be about 3.14 times the length of its diameter. It stands for the ratio between the circumference of any circle and its diameter, and it's true for all circles. ![]() The Greek letter p (pronounced as "pie") is used to describe this number. Its value is about 3.1415926535897. Pi is also a constant, which means it is always equal to the same value. Pi (Π) is a non-terminating number, which means it goes on forever and has no end. This measurement is always equal to twice the radius (2r).
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