Q3 of 69 Page 9

In Δ ABC, if ∠B = 60°, ∠C = 80° and the bisectors of angles ∠ABC and ∠ACB meet at a point O, then find the measure of ∠BOC.

In BOC,

∠BOC + ∠OCB + ∠OBC = 180°


∠BOC + 1/2 × (80) + 1/2 × (40) = 180°


∠BOC = 180° -70o


∠BOC = 110°


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