Question

terminology of circle

Answer 1

Annulus: the ring-shaped object, the region bounded by two concentric circles. Centre: the point equidistant from the points on the circle. Chord: a line segment whose endpoints lie on the circle. Circumference: the length of one circuit along the circle, or the distance around the circle.

Answer 2

A Cricle is point an plane which rotates around the centre of its body.