$I n Δ A B C, ∠ A = 40^{\circ} a n d ∠ B = 60^{\circ} . Then, the longest side of Δ A B C i s (a) B C (b) A C (c) A B (d) cannot be determined$

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Solution

ANSWER:
(c) AB
In triangle ABC, we have:
∠A=40°,∠B=60°
...(Given)
Here, ∠A+∠B+∠C=180°⇒60°+40°+∠C=180°⇒∠C=80°
∴ The side opposite to∠C, i.e., AB, is the longest side of triangle ABC.

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