From the given figure
Point A is (-8, 3) and point B is (-3, -4)
If the triangle is a right triangle, then the right angle must be the 3rd vertex
This third vertex should have the same x-coordinate of A OR B and the same y-Coordinate of B OR A
For the first case, the point should be (-8, -4)
For the second case, the point is (-3, 3)
The
