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Table of Contents:

**Area of Circle** = πr²

**Diameter of Circle** = 2r

**Circumference of Circle** = 2πr = πd

**Area of Sector** = πr² (θ/360) = ½ *arc * (angle in degree)

**where,**

r = radius

π = 3.14

A Circle is a set of points that is formed in a closed loop, every point on which is a fixed distance from a center point. The radius of a circle is the distance from the center of a circle to any point on the circle. The distance across a circle through the center is called the diameter.

A **circle** is a round plane figure whose boundary or the circumference consists of points equidistant from a fixed center.

__Properties of a Circle__:

** Center - **A point inside the circle. All points on the circle are equidistant (same distance) from the center point.

** Examples:** Find the area, diameter and circumference of a circle with the given radius 4.

Area = πr² = 3.14 * 4² = 3.14 * 16 =

Diameter = 2r = 2 *4 =

Circumference = πd = 3.14 *8 =