There are many steps to find the coordinates of the vertices of triangle ABC. The slope formula is y2 - y1 / x2 - x1 There would be three equation associated with this problem.
The first equation can be found by taking the x and y's from A and B First Equation: 2 - 3 / 1 - (-1) Answer: -.5
The second equation can be found by taking the x and y's from B and C Second Equation: -1 - 2 / -3 - 1 Answer: 12
The third equation can be found by taking the x and y's from C and A Third Equation: 3 - (-1) / -1 - (-3) Answer: 2
These are not equal measurements so, it isn't right angle.
