C Program for Program to find area of a circle

Area of a circle can simply be evaluated using following formula.

Area = pi * r²
where r is radius of circle

#include <math.h> 
#include <stdio.h> 
#define PI 3.142 
  
double findArea(int r) 
{ 
    return PI * pow(r, 2); 
} 
  
int main() 
{ 
    printf("Area is %f", findArea(5)); 
    return 0; 
} 

Output:

Area is 78.550000

Please refer complete article on Program to find area of a circle for more details!

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