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  1. #include <iostream>
  2. #include <cmath>
  3. using namespace std;
  4.  
  5. int main(){
  6.     double xA, yA, xB, yB, xC, yC, AB, BC, CA, alpha, beta, gamma;
  7.     cin >> xA >> yA >> xB >> yB >> xC >> yC;
  8. 	if ((xA==xB) && (xB==xC) && (yA == yB) && (yB == yC))
  9. 	{
  10. 		cout << ("Невозможно определить тип треугольника");
  11. 	}
  12. 	else if ((xA==xB && yA==yB) || (xB==xC && yB==yC) || (xC==xA && yC==yA))
  13. 	{
  14. 		cout << ("прямоугольный");	
  15. 	}
  16. 	else 
  17. 	{
  18. 		AB = sqrt((xB-xA)*(xB-xA)+(yB-yA)*(yB-yA));
  19. 		BC = sqrt((xC-xB)*(xC-xB)+(yC-yB)*(yC-yB));
  20. 		CA = sqrt((xA-xC)*(xA-xC)+(yA-yC)*(yA-yC));
  21. 		alpha = (AB*AB + CA*CA - BC*BC)/(2*AB*CA);
  22. 		beta = (AB*AB + BC*BC -CA*CA)/(2*AB*BC);
  23. 		gamma = (CA*CA + BC*BC - AB*AB)/(2*CA*BC);
  24. 		{
  25. 			if (( alpha == 0 ) || (beta == 0) || (gamma == 0))
  26. 			{
  27. 				cout << ("прямоугольный") ;
  28. 			}
  29. 			if ((alpha < 0)||(beta < 0) || (gamma < 0)) 
  30. 			{
  31. 				cout << ("тупоугольный") ;
  32. 			}
  33. 			if ((alpha > 0) && (beta > 0) && (gamma > 0))
  34. 			{
  35. 				cout << ("остроугольный") ;
  36. 			}
  37. 	    }
  38. 	}
  39. 	return 0;
  40. }
Success #stdin #stdout 0s 3476KB
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stdin
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stdout
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остроугольный
https://ideone.com/LfWkbB
Ю2.3
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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