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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 do you find the circumference of a circle?

A: Find the circumference of a circle using the formula 2 x π x r. You need the value of π, or pi, and the radius of the circle.... Full Answer >Filed Under: -
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## Does a circle have rotational symmetry?

A: Rotational symmetry is a characteristic of any perfect circle. This means that the shape can be rotated less than 360 degrees and still appear exactly the ... Full Answer >Filed Under: -
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## What is the formula for radius?

A: The formula for a radius is the diameter of a circle divided by two. The radius of a circle is defined as the distance from the middle of a circle to any p... Full Answer >Filed Under: -
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## How do you measure the diameter of a round object?

A: The diameter of a circle is the length of a straight line going from one side of a circle to the opposite side. To measure the diameter, simply choose two ... Full Answer >Filed Under: