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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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## 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 the equation of a circle?

A: Find the equation of a circle using the formula (x-h)squared+(y-k)squared=r squared. Know that h and k represent the coordinates for the center, with h bei... Full Answer >Filed Under: -
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## What are some common shapes?

A: Some common shapes include the circle, the square and a triangle. Each of these shapes consists of either multiple lines or curves in some ratio. Full Answer >Filed Under: -
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## What is an eccentric circle?

A: Eccentric circles are circles that do not share the same center although the centers of each circle are all contained within at least one of the circles. T... Full Answer >Filed Under: