如图，已知BC是⊙O的直径，AB是⊙O的弦，切线AD交BC的延长线于D,若∠D=40°，则∠B的度数是_刷题宝

题干

如图，已知BC是⊙O的直径，AB是⊙O的弦，切线AD交BC的延长线于D,若∠D=40^°，则∠B的度数是（）

A：40°

B：50°

C：25°

D：115°

上一题下一题 0.0难度选择题更新时间:2012-02-11 08:11:41

答案(点此获取答案解析）

C

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