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  1. import java.util.*;
  2. import java.lang.*;
  3. import java.io.*;
  4. import java.math.*;
  5.  
  6. class Ideone
  7. {
  8. 	public static void main (String[] args) throws java.lang.Exception
  9. 	{
  10. 		double xA, yA, xB, yB, xC, yC, AB, BC, CA, alpha, beta, gamma;
  11. 	    Scanner in = new Scanner(System.in);
  12. 	    xA = in.nextDouble();
  13. 	    yA = in.nextDouble();
  14. 	    xB = in.nextDouble();
  15. 	    yB = in.nextDouble();
  16. 	    xC = in.nextDouble();
  17. 	    yC = in.nextDouble();
  18. 		if ((xA==xB) && (xB==xC) && (yA == yB) && (yB == yC))
  19. 		{
  20. 			System.out.printf ("Невозможно определить тип треугольника");
  21. 		}
  22. 		else if ((xA==xB && yA==yB) || (xB==xC && yB==yC) || (xC==xA && yC==yA))
  23. 		{
  24. 			System.out.printf ("прямоугольный");	
  25. 		}
  26. 		else 
  27. 		{
  28. 			AB = Math.sqrt((xB-xA)*(xB-xA)+(yB-yA)*(yB-yA));
  29. 			BC = Math.sqrt((xC-xB)*(xC-xB)+(yC-yB)*(yC-yB));
  30. 			CA = Math.sqrt((xA-xC)*(xA-xC)+(yA-yC)*(yA-yC));
  31. 			alpha = (AB*AB + CA*CA - BC*BC)/(2*AB*CA);
  32. 			beta = (AB*AB + BC*BC -CA*CA)/(2*AB*BC);
  33. 			gamma = (CA*CA + BC*BC - AB*AB)/(2*CA*BC);
  34. 			{
  35. 				if (( alpha == 0 ) || (beta == 0) || (gamma == 0))
  36. 				{
  37. 					System.out.printf ("прямоугольный") ;
  38. 				}
  39. 				if ((alpha < 0)||(beta < 0) || (gamma < 0)) 
  40. 				{
  41. 					System.out.printf ("тупоугольный") ;
  42. 				}
  43. 				if ((alpha > 0) && (beta > 0) && (gamma > 0))
  44. 				{
  45. 					System.out.printf ("остроугольный") ;
  46. 				}
  47. 		    }
  48. 		}
  49. 	}	
  50. }
Success #stdin #stdout 0.15s 321344KB
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остроугольный
https://ideone.com/yrS444
Ю2.3
language:
Java (HotSpot 12)
created:
8 years ago
visibility:
secret

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