Point M and N are on the sides PQ and QR respectively of a triangle PQR, right angled at Q. If PN = 9 cm, MR = 7 cm and MN = 3 cm, then find the length of PR (in cm).
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. 11.
PN2 + MR2 = MN2 + PR2
⇒ 92 + 72 = 32 + PR2
⇒ 81 + 49 - 9 = PR2
⇒ PR = = 11