Mathematics

Problem

\triangle ABC

and

\triangle PQR

are right-angled at

B

and

Q

respectively. If

AB = PQ = 9\,\text{cm}

and

AC = PR = 15\,\text{cm}

, the length of

QR

is a) 15\,\text{cm} b) 12\,\text{cm} c) 9\,\text{cm} d) 6\,\text{cm}