In ΔPQR, Q is a right angle, the lengths of PQ and PR are 8 cm and 17 cm, respectively. Find the length of QR.
A
13 cm
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B
14 cm
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C
15 cm
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D
16 cm
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Solution
The correct option is C 15 cm ΔPQR is a right angled triangle. ∠Q = 90°, PQ = 8 cm, and PR = 17 cm According to pythagoras theorem, PQ² + QR² = PR² ⇒ (8)² + (QR)² = (17)² ⇒ 64 + (QR)² = 289 ⇒ (QR)² = 225 ⇒ QR = 15 cm