Let A = point (-3,3), B = point (3,4) and C = point (3,-3)
Using the distance formula (google it):
AB^2 = (-3-3)^2 + (3-4)^2
= 36 + 1
AB = square root of 37 units
BC^2 = (3-3)^2 + (4+3)^2
= 144
BC = 12 units
AC^2 = (-3-3)^2 + (3+3)^2
= 36 + 81
AC = square root of 117 units
Perimeter = AB + BC +AC
= root 37 + 12 + root 117
= root 37 + 12 + 3 root 13
