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  1. #include <iostream>
  2. #include <cmath> 
  3. using namespace std;
  4. int main() {
  5. 	double R, r;
  6. 	cin>>R>>r;
  7. 	cout<<R*R*M_PI-r*r*M_PI<<endl;
  8. 	return 0;
  9. }
Success #stdin #stdout 0s 3416KB
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https://ideone.com/IkDkrK
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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