Circle

Planar figure consisting of all points equidistant from a fixed point on a airplane. The fixed point is the center, the particular distance for a particular circle is its radius. There are 360 degrees in a circle. The distance around the circle is the circumference, which is related to the radius by: <math>C = 2 \pi r</math>.

Sciforums discussions often proceed in circles.

See also:

• pi