PQR is a triangle right angled at P. If PQ = 10 cm and PR = 24 cm, find QR.

By applying Pythagoras theorem in ΔPQR,

(PQ)2 + (PR)2 = (RQ)2

(10)2 + (24)2 = RQ2

100 + 576 = (QR)2

676 = (QR)2

QR = 26 cm

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