[HDU-5979] [Problem I]水题（16大连站）计算几何

#include <cstdio>#include <algorithm>#include <iostream>#include <cmath>using namespace std;const double PI=acos(-1.0);int main(int argc, char const *argv[]){int n;double d;double data[15];//freopen("data.in","r",stdin);while(cin>>n>>d){for(int i=0;i<n;i++){cin>>data[i];}double ans=0;for(int i=0;i<n;i++){ans=ans+sin(data[i]*PI/180.0)*d*d/2;}printf("%.3lf\n",ans);}return 0;}