Question 130

In ΔABC, ∠A + ∠B = 65°, ∠B + ∠C = 140°, then find LB.

Solution

Given : $$\angle$$A + $$\angle$$B = 65°

We know that in a triangle

=> $$\angle$$A + $$\angle$$B + $$\angle$$C = 180°

=> $$\angle$$C = 180°-65° = 115°

It is also given that : $$\angle$$B + $$\angle$$C = 140°

=> $$\angle$$B = 140-115 = 25°

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