Area of a Circle
C Program to Calculate area of a 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
Area = Pie*radius*radius
Here Pie is constant which is equal to
Pie = 22/7 or
3.1415926535897932384626…
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