1.

In Δabc, ∠a + ∠b = 65°, ∠b + ∠c = 140°, Then Find ∠b.

Answer»

∠A + ∠B = 65°

∴ ∠C = 180° - 65° = 115°

∠B + ∠C = 140°

∴ ∠B = 140° - 115° = 25°

∠A + ∠B = 65°

∴ ∠C = 180° - 65° = 115°

∠B + ∠C = 140°

∴ ∠B = 140° - 115° = 25°



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