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  1. #include <cstdio>
  2. #include <iostream>
  3. #include <cmath>
  4. using namespace std;
  5.  
  6. const double PI = 3.14159265358979323846264338327950288419716939937510582097494459230781641;
  7.  
  8. int main() {
  9. 	double a, b, c, r;
  10. 	cin >> a >> b >> c >> r;
  11. 	double p = (a + b + c) / 2;
  12. 	double S = sqrt(p * (p-a) * (p-b) * (p-c));
  13. 	double R = S / p;
  14. 	double coef = r / R;
  15. 	double saved = coef * coef * (S - PI*R*R);
  16. 	printf("%.15f\n", (S - saved) / S);
  17. }
  18.  
Success #stdin #stdout 0s 3432KB
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0.880899693899575
https://ideone.com/bEzVz0
language:
C++ (gcc 8.3)
created:
9 years ago
visibility:
secret

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