UVA Problem 10432 (Polygon Inside A Circle) Solution

Problem Solving, UVa

#include <bits/stdc++.h>

using namespace std;

#define PI 2*acos(0.0)

int main()

{

     double r ,n,a,ans;

    while(scanf("%lf %lf",&r,&n)==2)

    {

        a=(r*r*sin(2*PI/n))/2;

        ans=n*a;

    printf("%.3lf\n",ans);

   

    }

    return 0;

}

 

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