题目内容
如果点O为△ABC的外心,∠BOC=70°,那么∠BAC等于( )
A.35° | B.110° | C.145° | D.35°或145° |
①当点O在三角形的内部时,
则∠BAC=
∠BOC=35°;
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②当点O在三角形的外部时,
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则∠BAC=
(360°-70°)=145°.
故选D.
则∠BAC=
1 |
2 |
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②当点O在三角形的外部时,

则∠BAC=
1 |
2 |
故选D.
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