// Code to find all three angles   // of a triangle given coordinate   // of all three vertices   #include          #include         // for pair   #include         // for math functions   using     namespace     std  ;   #define PI 3.1415926535   // returns square of distance b/w two points   int     lengthSquare  (  pair   <  int    int  >     X       pair   <  int    int  >     Y  )   {      int     xDiff     =     X  .  first     -     Y  .  first  ;      int     yDiff     =     X  .  second     -     Y  .  second  ;      return     xDiff  *  xDiff     +     yDiff  *  yDiff  ;   }   void     printAngle  (  pair   <  int    int  >     A       pair   <  int    int  >     B        pair   <  int    int  >     C  )   {      // Square of lengths be a2 b2 c2      int     a2     =     lengthSquare  (  B    C  );      int     b2     =     lengthSquare  (  A    C  );      int     c2     =     lengthSquare  (  A    B  );      // length of sides be a b c      float     a     =     sqrt  (  a2  );      float     b     =     sqrt  (  b2  );      float     c     =     sqrt  (  c2  );      // From Cosine law      float     alpha     =     acos  ((  b2     +     c2     -     a2  )  /  (  2  *  b  *  c  ));      float     beta     =     acos  ((  a2     +     c2     -     b2  )  /  (  2  *  a  *  c  ));      float     gamma     =     acos  ((  a2     +     b2     -     c2  )  /  (  2  *  a  *  b  ));      // Converting to degree      alpha     =     alpha     *     180     /     PI  ;      beta     =     beta     *     180     /     PI  ;      gamma     =     gamma     *     180     /     PI  ;      // printing all the angles      cout      < <     'alpha : '      < <     alpha      < <     endl  ;      cout      < <     'beta : '      < <     beta      < <     endl  ;      cout      < <     'gamma : '      < <     gamma      < <     endl  ;   }   // Driver code   int     main  ()   {      pair   <  int    int  >     A     =     make_pair  (  0    0  );      pair   <  int    int  >     B     =     make_pair  (  0    1  );      pair   <  int    int  >     C     =     make_pair  (  1    0  );      printAngle  (  A    B    C  );      return     0  ;   }   

   // Java Code to find all three angles   // of a triangle given coordinate   // of all three vertices   import     java.awt.Point  ;   import static     java.lang.Math.PI  ;   import static     java.lang.Math.sqrt  ;   import static     java.lang.Math.acos  ;   class   Test   {      // returns square of distance b/w two points      static     int     lengthSquare  (  Point     p1       Point     p2  )      {      int     xDiff     =     p1  .  x  -     p2  .  x  ;      int     yDiff     =     p1  .  y  -     p2  .  y  ;      return     xDiff  *  xDiff     +     yDiff  *  yDiff  ;      }          static     void     printAngle  (  Point     A       Point     B        Point     C  )      {      // Square of lengths be a2 b2 c2      int     a2     =     lengthSquare  (  B    C  );      int     b2     =     lengthSquare  (  A    C  );      int     c2     =     lengthSquare  (  A    B  );          // length of sides be a b c      float     a     =     (  float  )  sqrt  (  a2  );      float     b     =     (  float  )  sqrt  (  b2  );      float     c     =     (  float  )  sqrt  (  c2  );          // From Cosine law      float     alpha     =     (  float  )     acos  ((  b2     +     c2     -     a2  )  /  (  2  *  b  *  c  ));      float     betta     =     (  float  )     acos  ((  a2     +     c2     -     b2  )  /  (  2  *  a  *  c  ));      float     gamma     =     (  float  )     acos  ((  a2     +     b2     -     c2  )  /  (  2  *  a  *  b  ));          // Converting to degree      alpha     =     (  float  )     (  alpha     *     180     /     PI  );      betta     =     (  float  )     (  betta     *     180     /     PI  );      gamma     =     (  float  )     (  gamma     *     180     /     PI  );          // printing all the angles      System  .  out  .  println  (  'alpha : '     +     alpha  );      System  .  out  .  println  (  'betta : '     +     betta  );      System  .  out  .  println  (  'gamma : '     +     gamma  );      }          // Driver method      public     static     void     main  (  String  []     args  )         {      Point     A     =     new     Point  (  0    0  );      Point     B     =     new     Point  (  0    1  );      Point     C     =     new     Point  (  1    0  );          printAngle  (  A    B    C  );      }   }   

   # Python3 code to find all three angles    # of a triangle given coordinate    # of all three vertices    import   math   # returns square of distance b/w two points    def   lengthSquare  (  X     Y  ):   xDiff   =   X  [  0  ]   -   Y  [  0  ]   yDiff   =   X  [  1  ]   -   Y  [  1  ]   return   xDiff   *   xDiff   +   yDiff   *   yDiff   def   printAngle  (  A     B     C  ):   # Square of lengths be a2 b2 c2    a2   =   lengthSquare  (  B     C  )   b2   =   lengthSquare  (  A     C  )   c2   =   lengthSquare  (  A     B  )   # length of sides be a b c    a   =   math  .  sqrt  (  a2  );   b   =   math  .  sqrt  (  b2  );   c   =   math  .  sqrt  (  c2  );   # From Cosine law    alpha   =   math  .  acos  ((  b2   +   c2   -   a2  )   /   (  2   *   b   *   c  ));   betta   =   math  .  acos  ((  a2   +   c2   -   b2  )   /   (  2   *   a   *   c  ));   gamma   =   math  .  acos  ((  a2   +   b2   -   c2  )   /   (  2   *   a   *   b  ));   # Converting to degree    alpha   =   alpha   *   180   /   math  .  pi  ;   betta   =   betta   *   180   /   math  .  pi  ;   gamma   =   gamma   *   180   /   math  .  pi  ;   # printing all the angles    print  (  'alpha :   %f  '   %  (  alpha  ))   print  (  'betta :   %f  '   %  (  betta  ))   print  (  'gamma :   %f  '   %  (  gamma  ))   # Driver code   A   =   (  0     0  )   B   =   (  0     1  )   C   =   (  1     0  )   printAngle  (  A     B     C  );   # This code is contributed    # by ApurvaRaj   

   // C# Code to find all three angles   // of a triangle given coordinate   // of all three vertices   using     System  ;       class     GFG   {      class     Point      {      public     int     x       y  ;      public     Point  (  int     x       int     y  )      {      this  .  x     =     x  ;      this  .  y     =     y  ;      }      }          // returns square of distance b/w two points      static     int     lengthSquare  (  Point     p1       Point     p2  )      {      int     xDiff     =     p1  .  x     -     p2  .  x  ;      int     yDiff     =     p1  .  y     -     p2  .  y  ;      return     xDiff     *     xDiff     +     yDiff     *     yDiff  ;      }          static     void     printAngle  (  Point     A       Point     B       Point     C  )      {      // Square of lengths be a2 b2 c2      int     a2     =     lengthSquare  (  B       C  );      int     b2     =     lengthSquare  (  A       C  );      int     c2     =     lengthSquare  (  A       B  );          // length of sides be a b c      float     a     =     (  float  )  Math  .  Sqrt  (  a2  );      float     b     =     (  float  )  Math  .  Sqrt  (  b2  );      float     c     =     (  float  )  Math  .  Sqrt  (  c2  );          // From Cosine law      float     alpha     =     (  float  )     Math  .  Acos  ((  b2     +     c2     -     a2  )     /         (  2     *     b     *     c  ));      float     betta     =     (  float  )     Math  .  Acos  ((  a2     +     c2     -     b2  )     /         (  2     *     a     *     c  ));      float     gamma     =     (  float  )     Math  .  Acos  ((  a2     +     b2     -     c2  )     /         (  2     *     a     *     b  ));          // Converting to degree      alpha     =     (  float  )     (  alpha     *     180     /     Math  .  PI  );      betta     =     (  float  )     (  betta     *     180     /     Math  .  PI  );      gamma     =     (  float  )     (  gamma     *     180     /     Math  .  PI  );          // printing all the angles      Console  .  WriteLine  (  'alpha : '     +     alpha  );      Console  .  WriteLine  (  'betta : '     +     betta  );      Console  .  WriteLine  (  'gamma : '     +     gamma  );      }          // Driver Code      public     static     void     Main  (  String  []     args  )         {      Point     A     =     new     Point  (  0       0  );      Point     B     =     new     Point  (  0       1  );      Point     C     =     new     Point  (  1       0  );          printAngle  (  A       B       C  );      }   }   // This code is contributed by Rajput-Ji   

   // JavaScript program    // Code to find all three angles   // of a triangle given coordinate   // of all three vertices   // returns square of distance b/w two points   function     lengthSquare  (  X       Y  ){      let     xDiff     =     X  [  0  ]     -     Y  [  0  ];      let     yDiff     =     X  [  1  ]     -     Y  [  1  ];      return     xDiff  *  xDiff     +     yDiff  *  yDiff  ;   }   function     printAngle  (  A       B       C  ){          // Square of lengths be a2 b2 c2      let     a2     =     lengthSquare  (  B    C  );      let     b2     =     lengthSquare  (  A    C  );      let     c2     =     lengthSquare  (  A    B  );      // length of sides be a b c      let     a     =     Math  .  sqrt  (  a2  );      let     b     =     Math  .  sqrt  (  b2  );      let     c     =     Math  .  sqrt  (  c2  );      // From Cosine law      let     alpha     =     Math  .  acos  ((  b2     +     c2     -     a2  )  /  (  2  *  b  *  c  ));      let     beta     =     Math  .  acos  ((  a2     +     c2     -     b2  )  /  (  2  *  a  *  c  ));      let     gamma     =     Math  .  acos  ((  a2     +     b2     -     c2  )  /  (  2  *  a  *  b  ));      // Converting to degree      alpha     =     alpha     *     180     /     Math  .  PI  ;      beta     =     beta     *     180     /     Math  .  PI  ;      gamma     =     gamma     *     180     /     Math  .  PI  ;      // printing all the angles      console  .  log  (  'alpha : '       alpha  );      console  .  log  (  'beta : '       beta  );      console  .  log  (  'gamma : '       gamma  );   }   // Driver code   let     A     =     [  0       0  ];   let     B     =     [  0       1  ];   let     C     =     [  1       0  ];   printAngle  (  A    B    C  );   // The code is contributed by Gautam goel (guatamgoel962)