**A** C**ircle** 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.

Here,

- 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.**