已知A,B,C是⊙O上不同的三个点,∠AOB=60°,则∠ACB=( )
A.60° | B.30° | C.60°或120° | D.30°或150° |
更新时间:2014-12-09 17:02:15
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【知识点】 圆
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【推荐1】如图,⊙O的半径为2,点O到直线l的距离为3,点P是直线l上的一个动点,PQ切⊙O于点Q,则PQ的最小值为
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【推荐2】抖空竹在我国有着悠久的历史,是国家级的非物质文化遗产之一.如示意图,
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