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## Circle - Wikipedia

en.wikipedia.org/wiki/Circle

A circle is a simple closed shape in Euclidean geometry. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently  ...

## Who invented the circle? | Reference.com

www.reference.com/math/invented-circle-b1c0944e4208f853

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  ...

## William Jones and his Circle: The Man who invented Pi | History Today

www.historytoday.com/patricia-rothman/william-jones-and-his-circle-man-who-invented-pi

The history of the constant ratio of the circumference to the diameter of any circle is as old as man's desire to measure; whereas the symbol for this ratio known ...

## Circle

jwilson.coe.uga.edu/EMT668/EMAT6680.F99/Kim/emat6690/instructional unit/circle/Circle/Circle.htm

History. The study of the circle goes back beyond the recorded history. The invention of the wheel is a fundamental discovery of properties of a circle. The Greeks ...

## History of Circles | Circles Only's Blog

circlesonly.wordpress.com/category/history-of-circles/

Posts about History of Circles written by circlesonly. ... It is a mental construct, a symbolic representation that was invented much the same as language and the ...

## Circle - MacTutor History of Mathematics

www-history.mcs.st-and.ac.uk/Curves/Circle.html

Circle. Cartesian equation: x<sup>2</sup> + y<sup>2</sup> = a<sup>2</sup> or parametrically: x = a cos(t), y = a sin(t) Polar equation: r = a. Click below to see one of the Associated curves.

## Who determined that a circle should be divided into 360 degrees ...

www.popsci.com/scitech/article/2002-02/who-determined-circle-should-be-divided-360-degrees

Feb 5, 2002 ... _ The same people who invented the wheel about 6000 years ago: the ... the ancient Egyptians, who used it to divide a circle into 360 degrees, ...

## USATODAY.com - The 360-degree circle is 4400 years old

usatoday30.usatoday.com/news/science/wonderquest/2002-06-21-circle.htm

Jun 21, 2002 ... Q: Why does a circle have 360 degrees, why not 100 degrees? ... writing, observed the skies, and invented a 360-degree circle to describe their ...