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
...

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
...

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 ...

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 ...

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 ...

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.

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, ...

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 ...

uncyclopedia.wikia.com/wiki/Circle

The first circle was invented by God on the ninth day of creation (after the First
Sabbath and circumcision of the world). It is the most pointless shape that exists,
...

www.quora.com/Who-is-the-person-who-invented-the-idea-of-Circles

The concept can be traced back to Paul Adams and his well publicized slideshow
"The Real ... I think that Google+ Circles is an awesome idea! UpdateCancel.