Circle
Circle :
(Geom) The closed curve formed by points equally distant from a fixed point in a plane. The line bounding the circle is the circumference, a line from edge to edge through the center is the diameter, and a line from the center to the edge is the radius. The circumference is 2pi♦r, where pi = (3)141E and r is the radius; the area is pi♦r2, or 0. 7854♦D2, where D is the diameter
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