Write a program to calculate area of a circle. To calculate the area of a circle use the Mathematical formula define below.

Area of Circle is : π × r

Where

Let's say someone input the value of radius of circle (r) is 3.

Area of circle is : 3.14 * 3 * 3

:28.27

C Program to Calculate Simple Interest.

Print factors of a number.

Enter radius of a circle: 3

Area of circle is : 28.260001

Area of Circle is : π × r

^{2}Where

**r**is the radius of the circle and the value of**PI**is 3.14 (22/7).Let's say someone input the value of radius of circle (r) is 3.

Area of circle is : 3.14 * 3 * 3

:28.27

C Program to Calculate Simple Interest.

Print factors of a number.

## Program to Calculate Area of Circle

#include <stdio.h> int main() { int radius; /* Declare PI and area as float datatype. */ float PI=3.14,area; /* Take radius of a circle as a input from user. */ printf("\n Enter radius of a circle: "); scanf("%d",&radius); /* Area of circle */ area = PI * radius * radius; printf("\nArea of circle is : %f ",area); return(0); }

**Output:**Enter radius of a circle: 3

Area of circle is : 28.260001

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