From the diagram above, Calculate the distance between any two vertices as follows.
PQ = √(6−3)2+(2−2)2 = √9 = 3
QR = √(6−4)2+(2−5)2 = √13
PR = √(4−3)2+(5−1)2 = √10
∴, perimeter = 3 + √13 + √10
