Tuesday, July 28, 2015

1022 - Circle in Square

#include<bits/stdc++.h>
using namespace std;
 
 
int main()
{
    int T,c=1;
    double r;
    scanf("%d",&T);
    while(T--)
    {
        scanf("%lf",&r);
        printf("Case %d: %.2lf\n",c++,((2*r)*(2*r)-2*acos(0.0)*r*r)+pow(10.0,-9.0));
    }
    return 0;
}

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