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  1. #include <iostream>
  2. #include <cmath>
  3. #define sqr
  4. using namespace std;
  5.  
  6. int main() {
  7. 	long double a, s;
  8. 	cin >> a;
  9. 	s = sqr(a) * 1.7320508075 / 4;
  10. 	cout.precision(11); //Выводим площадь треугольника до 10 знака после запятой
  11. 	cout << s << endl;
  12. 	return 0;
  13. }
Success #stdin #stdout 0s 3464KB
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stdin
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9223372036854773806
stdout
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3.9938372461e+18
https://ideone.com/sndhfx
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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