已知:如图,O是△ABC内一点,且OB、OC分别平分∠ABC、∠ACB,若∠A=46°,求∠BOC=______

日期:2016-04-19 05:13:22 人气:1

已知:如图,O是△ABC内一点,且OB、OC分别平分∠ABC、∠ACB,若∠A=46°,求∠BOC=______

∵OB、OC分别是∠ABC和∠ACB的角平分线,∴∠OBC+∠OCB=12∠ABC+12∠ACB=12(∠ABC+∠ACB),∵∠A=46°,∴∠OBC+∠OCB=12(180°-46°)=67°,∴∠BOC=180°-(∠OBC+∠OCB)=180°-67°=113°.故答案为:113°.
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