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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main()
  6. { 
  7. 	double m,R;
  8. 	cin >> m >> R;
  9. 	cout << 2*R*sin(M_PI/m)*m;
  10. return 0;
  11. }
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https://ideone.com/qrbwro
Периметр правильного m-угольника через радиус R описанной окружности
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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