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  1. #include <cstdio>
  2. #include <algorithm>
  3. using namespace std;
  4.  
  5. int main()
  6. {
  7.     double x, y, z;
  8. 	scanf( "%lf %lf %lf", &x, &y, &z );
  9.  
  10. 	if ( x > y ) swap( x, y );
  11. 	if ( y > z ) swap( y, z );
  12.  
  13.     //if the triangle exists
  14.     if( x + y > z )
  15.     {
  16.         //if it is acute
  17.         double COS_VALUE =  ( x*x + y*y - z*z ) / ( 2*x*y );
  18.         if( COS_VALUE > 0 ) printf( "The triangle is acute." );
  19.         else printf( "The triangle is not acute." );
  20.     }
  21.     else printf( "The triangle doesn't exist." );
  22.     return 0;
  23. }
Success #stdin #stdout 0s 3300KB
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10 11 12
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The triangle is acute.
https://ideone.com/cCkKW0
Абрамов, 47
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
public

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