It was the Babylonians who first divided the circle into 360 degrees in order to integrate the geometry they developed with the 360-day calendar then in use. The Babylonians devised a counting system based not on units o... More »

A 360 degree angle is called a full circle. Angles can be measured from zero degrees all the way to 360 degrees because 360 degrees is one full rotation. More »

The equation for the area of a circle is pi times the square of the radius or A = πr2. Calculating the area of a sector involves figuring out what fraction of the circle's area the sector covers. More »

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In geometry, the half circle is referred to as the semicircle. The semicircle is made by dividing a whole circle along its diameter. Alternatively, a semicircle could also be an open arc where a curved line represents ha... More »

To find the arc of a circle, divide the angle subtended at the center of the arc by 360 degrees, then multiply the answer by the circumference of the circle. You need to know the value of pi and must have a protractor to... More »

There are exactly 360 degrees in any circle. A circle is a two dimensional shape that consists of a consistently curved line that continues until it meets itself. More »

The Babylonians used a base 60 numbering system that serves as the basis of modern time telling and the degrees in a circle. Modern mathematical systems use a base 10 system for easy counting, but the number of seconds i... More »

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