PQRis an isosceles triangle such that PQ = QR = 10 cm and $$\triangle PQR = 90^\circ$$. What is the length of the perpendicular drawn from Q on PR?

A

$$6 \sqrt 2 cm$$

B

$$7 \sqrt 2 cm$$

C

$$5 \sqrt 2 cm$$

D

$$4 \sqrt 2 cm$$