# C Program to Calculate Area and Circumference of circle

## How to calculate Area and Circumference of circle in c

In this program only apply here formula of area and circumference of a circle. Firstly input here radius and then work with fix value PI use here area = PI * rad * rad; and then ci = 2 * PI * rad;Beginner C Program to find area and circumference of circle

Output :

Enter the radius of acircle: 3

Area of a circle is: 28.260000

The Circumference is: 18.840000

## Explanation of This Program :

In this program, we are finding the circumference and area of the circle. We have the 2 formulas to find circumference and area of the circle below.

**Circumference of Circle = 2 * pi * r**

Area of Circle **= pi * r * r**

First input radius from the user then uses this following formula given below.

**area = pi * rd * rd;**

And
**CI = 2 * pi * rd;**

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