32 lines
582 B
C++
32 lines
582 B
C++
#include<iostream>
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#include<cstdio>
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#include<cstring>
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#include<string>
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#include<algorithm>
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#include<sstream>
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#include<map>
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#include<set>
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#include<cmath>
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#include<iomanip>
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#include<cstdlib>
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#include<cctype>
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#include<assert.h>
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#include<stack>
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#include<queue>
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#include<vector>
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#include<list>
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using namespace std;
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double pi=acos(-1);
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double w,r,sita;
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int main() {
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while(~scanf("%lf%lf%lf",&r,&w,&sita))
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{
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sita/=180.;
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sita*=pi;
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double umc=cos(sita/2.)-1.;
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r-=w/umc;
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printf("%.3f\n",r);
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}
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return 0;
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}
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