In a right-angled triangle ABC, if angle B = 90°, BC = 3 cm and AC = – InterviewSolution

1.

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

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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