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# Circle Calculator

To use the circle calculator, fill the required input boxes and hit the calculate button

Table of Contents:

## Formula

**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.

**The radius is the distance from the center to any point on the circle. It is half the diameter. See Radius of a circle.**

__Radius__-**Diameter -**The distance across the circle. The length of any chord passing through the center. It is twice the radius. See Diameter of a circle.

**- The circumference is the distance around the circle.**

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

**Find the area.**

__Step 1__:Area = πr² = 3.14 * 4² = 3.14 * 16 =

**50.24**

**Find the diameter.**

__Step 2__:Diameter = 2r = 2 *4 =

**8**

**Find the circumference.**

__Step 3__:Circumference = πd = 3.14 *8 =

**25.12**