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