Question

1.如图,BO、CO分别平分∠ABC和∠ACB.

Answer 1

.∵∠A=60°∴∠ABC+∠ACB=180°—∠A＝120°∵BO,CO分别平分∠ABC和 ∠ACB∴∠OBC=1/2∠ABC,∠OCB=1/2∠ACB∴∠OBC+∠OCB=1/2(∠ABC+∠ACB)=60°∴∠O=120°2.当∠A=100°时,∠O=130°当∠A=120°时,∠0=150° 理由...