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如图一在三角形ABC中角ABC 角ACB的平分线相交于点O角A=40度,求角BOC度数
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1个回答
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∵∠A=40°
∴∠ABC+∠ACB=180°-40°=140°
∴∠BOC=180°-1/2∠ABC-1/2∠ACB=180°-1/2(∠ABC+∠ACB)= 180°-1/2×140°=180°-70°=110°
∴∠ABC+∠ACB=180°-40°=140°
∴∠BOC=180°-1/2∠ABC-1/2∠ACB=180°-1/2(∠ABC+∠ACB)= 180°-1/2×140°=180°-70°=110°
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