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# Who invented the circle?

Since circular creations appear throughout nature, no man can be credited with the invention of the circle. From the cross-section of a plant stem to the moon and the sun, circles appear everywhere in nature.

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Ancient mathematicians, astronomers and engineers observed, measured and were inspired by the circle. Egyptian engineers used methods to compute areas and volumes for circles. As early as 1700 B.C., the Rhind papyrus records a method to find the area of a circular field. Written in 300 B.C., ���Book 3��� of Euclid's ���Elements��� deals with the characteristics of circles. Plato's ���Seventh Letter��� presents a detailed definition and explanation of the circle and the author���s conclusion that no one has ever seen a perfect circle, only approximations.

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## How should you find the circumference of a circle?

A: The circumference of a circle is the distance around the outskirts of the circle. Knowing the radius of any circle allows one to calculate its circumferenc... Full Answer >Filed Under: -
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## Why is pi important?

A: If the circumference or the area of a circle is known, pi can be used to find the diameter and the radius of that circle. Likewise, if the radius or diamet... Full Answer >Filed Under: -
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## How do you find diameter?

A: There are different ways to find the diameter of a circle depending on what information you start with. If you know the circumference of the circle, divide... Full Answer >Filed Under: -
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## How do you find the perimeter of a circle?

A: To find the perimeter of a circle, also known as the circumference, plug the dimensions of the circle into the formula ((pi)(d). This formula stands for pi... Full Answer >Filed Under: