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# Circle

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 = 2πr

Where, r is the radius of the circle.

## Area of Circle

The area of circle is the product of π to the square of radius.

A = πr²

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