C Program to Find Area and Circumference of Circle

In this example, we will find the C Program to Find Area and Circumference of circle when radius is given.

Area of Circle :- Area of any circle is the region enclosed by the circle itself or the space covered by the circle.

Circumference of a circle :- Circumference of the circle or perimeter of the circle is the measurement of the boundary of the circle.

Formulae :- 

Circumference of Circle – 2ℼr 

 Area of Circle – ℼr2 (where r is the radius of circle) and ℼ = 3.14

        Area = 63.605
        Circumference = 28.268

C Program to find area and circumference of circle

/*C program to find the area and circumference of a circle*/

#include <stdio.h>
#define PI 3.141

int main() 
  float radius,area, circum;

  printf("Enter the Radius of circle: ");
  scanf("%f", &radius);

  area = PI*radius*radius;
  circum = 2*PI*radius;

  printf("Area = %f \n", area);

  printf("circumference = %f \n", circum);

 return 0;



Output :-

Enter the Radius of circle: 4.5

Area = 63.605251
Circumference = 28.268999
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