In Problems 59–62, find the length of each side of the triangle
 determined by the three points P1, P, and Pz. State whether the
 triangle is an isosceles triangle, a right triangle, neither of these, or
 both. (An isosceles triangle is one in which at least two of the sides
 are of equal length.)
 59. P = (2,1); P2 = (-4,1); Pz = (-4,-3)