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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 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: -
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## What are some properties of a circle?

A: A circle is defined as the set of all points in a plane that are the same distance from another point, which is called the center of the circle. When these... Full Answer >Filed Under: -
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## What is the abbreviation for "circle"?

A: According to the U.S. Postal Service, the proper abbreviation for "circle" in addresses is "CIR." Although "CIRC," "CIRCL," "CRCL" and "CRCLE" are commonly... Full Answer >Filed Under: -
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## What is the formula for the circumference of a circle?

A: The formula for circumference of a circle is 2πr, where “r” is the radius of the circle and the value of π is approximately 22/7 or 3.14. The circumference... Full Answer >Filed Under: