In the triangle ABC, where ∠ a = 40 ° and O is the intersection of the bisectors of ∠ ABC and ∠ ACB, then ∠ BOC=______ .

In the triangle ABC, where ∠ a = 40 ° and O is the intersection of the bisectors of ∠ ABC and ∠ ACB, then ∠ BOC=______ .

∵∠ a = 40 °, ∵ ABC + ACB = 180 ° - a = 140 °, ∵ Bo and Co are bisectors of △ ABC, ABC and ACB, respectively, ∵ OBC = 12 ∠ ABC, ∵ OCB = 12 ∠ ACB, ∵ OBC + OCB = 12 (∵ ABC + ACB) = 70 °, BOC = 180 ° - (∵ OBC + OCB) = 180 ° - 70 ° = 1