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In a right-angled triangle ABC, if angle B = 90°, BC = 3 cm and AC = 5 cm, then the length of side AB is

(a) 3 cm (b) 4 cm (c) 5 cm (d) 6 cm

1 Answer

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Best answer

(b) 4 cm

From Pythagoras theorem.

AC2 = AB2 + BC2

52 = AB2 + 32

AB2 = 25 – 9

AB2 = 16

AB = √16

AB = 4 cm

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