A Circle is a simple closed shape or a curve.

A Circle is the set of all points in a plane that are at a given distance from a given point, the centre.

Bangles are simple examples of a circle.

Let us consider the figure below to understand the basic terms associated with circle.


  • OP, OQ, OR represents Radius.
  • PQ is the diameter.
  • APB and RQ is the Arc. 
  • Shaded region above AB is called a Segment.
  • Shaded region between the arc RQ, radii OQ and OR is called Sector.