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**en.wikipedia.org**/wiki/**Circle**

A circle is a simple closed shape. It is the set of all points in a plane that are at a given distance from a given point, the centre; equivalently it is the curve traced out by a point that moves in a plane so that its distance from a given point is constant.

www.answers.com/Q/**Who_discovered_the_circle**

Euclid discovered the circle and he named his geometry "Euclidean geometry " 7 people found this useful What is a circle? A circle is the set of all the points that are the same (arbitrary ...

www.quora.com/Who-knew-**or-discovered-the-earth-shape-in**...

Some say the American legend Christopher Columbus discovered first about the earth shape circle, while other histories say that Aristotle, one of the ancient Greek or Ferdinand Magellan one of the Portuguese explorers nor one of the ancient Persian nor Ptolemy (Claudius Ptolemaeus) discovered first?

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

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.

**en.wikipedia.org**/wiki/**Area_of_a_circle**

Although often referred to as the area of a circle in informal contexts, strictly speaking the term disk refers to the interior of the circle, while circle is reserved for the boundary only, which is a curve and covers no area itself. Therefore, the area of a disk is the more precise phrase for the area enclosed by a circle.

**www.quotev.com**/story/4124158/**The-Circle**/6

Tyler Myclon Julianne sprays the Blackout into Leven's eyes and we watch her fall. Julianne throws the blackout at the wall and grabs the knife. She starts shaking. "Everyone clear the table off.!" She scream at us. We automatically follow her instructions. Max steps up and picks up all the dishes and sets them to the side. Lily throws away the napkins and Aaron picks up the decora.....

**www.exploratorium.edu**/pi/history-of-pi

The ancient Babylonians calculated the area of a circle by taking 3 times the square of its radius, which gave a value of pi = 3. One Babylonian tablet (ca. 1900–1680 BC) indicates a value of 3.125 for π, which is a closer approximation. The Rhind Papyrus (ca.1650 BC) gives us insight into the mathematics of ancient Egypt.

www.answers.com/Q/**Who_discovered**_the_area_of_**the_circle**

A circle *encloses* an area, and the "area of a circle" is the areait encloses, Ï r^2. A circle is a 1-dimensional curved line; it is aset of points equidistant from a given point (the center ...

www.reference.com/math/invented-unit-**circle**-b0ba71b4db2f0a3e

Who Invented the Unit Circle? The unit circle does not have a known creator but was rather an amalgamation of different ideas from early astronomers and mathematicians. Contributors to the technology include the Babylonians, the Egyptians and the Greeks.

www.ams.org/publicoutreach/feature-column/fc-2012-02

Archimedes' essay on the `Measurement of a circle' is often referred to but, I suspect, little read. What most modern writers are interested in is the prescription for approximating $\pi$ by considering polygons with a large number of sides, and the recursive recipe he developed to do this.

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