Area and circumference of circle

Circumference :-Circumference of circle is the distance around the circle. 

        Calculate The Circumference of Circle By Given Formula

Circumference = 2*π*r    

Here Pi (π) is a Greek Letter and r is a Radius (1/2 Of Diameter )

Pi (π) = 3.141592653589793 Approx. It Is A Constant Value 

Area   =π *r*r

Answer :-

#include<stdio.h>

int main()

{

   

   int rad;

   float Pi = 3.14, area, ci;

   printf("\nEnter radius of circle: ");

   scanf("%d", &rad);

   area = Pi * rad * rad;

   printf("\nArea of circle : %f ", area);

   ci = 2 * Pi * rad;

   printf("\nCircumference : %f ", ci);

   return (0);

}

Output:-