A circle is a plane 2 dimensional closed shape. Circle is the set of all points in a plane that are at a given distance from a given point called the centre.

## What is Radius, Diameter and Circumference

A **radius** is the
distance from the centre to any point on the circumference of circle.

A **diameter** is the
distance from one point to another on the circumference of the circle passing through
the centre.

The distance around the edge of the circle or total length
of the boundary of the circle is known as perimeter of the circle. Usually perimeter
of a circle is known as *circumference. *

## Perimeter of Circle

The distance around the edge of the circle is known as perimeter
of the circle. Parameter of circle is known as **circumference**.

*C = 2Ď€r*

Where, ** r** is the radius of the circle.

## Area of Circle

The area of circle is the product of **Ď€ **to the square of radius.

*A = Ď€r**Â˛*