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C Program for Program to find area of a circle

  • Last Updated : 31 Mar, 2021

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;
Area is 78.550000


Time Complexity: O(1)

Auxiliary Space: O(1)

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

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