calculate area of a circle in c language | CTechnotips

C program for area of circle

#include <stdio.h>
#define PI 3.141
int main(){
  float r, a;
  printf("Radius: ");
  scanf("%f", &r);
  a = PI * r * r;
  printf("%f\n", a);
  return 0;

Mathematical formula for area of circle: 

Here Pie is constant which is equal to

Pie = 22/7 or 3.14159265358979323846264338327950288419716939937510...

Radius is radius of the circle.  


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