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.
You just add the two lengths and then do pythagorean theory to get the length of the hypotenuse. Then you add them all together to get 18.8. Hope this helps.
