A circle is the locus of a point which moves in a plane in such a way that its distance from a given fixed point in the plane is always constant.Interior and Exterior of a circle: Let C(O, r) be a given circle. A point P is said to lie inside, outside or on the given circle according as OP < r, OP > r or OP = r respectively. All the points lying inside a circle are called its interior... https://www.expertsmind.com/course-help/?p=circle-98734287125