1.如图一.C、D、E是圆O上的点,AB为直径则角1+∠2=?2.如图二,AB为圆O直径,∠BOC=120°.CD⊥AB求∠ABD?图地址http://hi.baidu.com/%D7%B7%CB%DD%C3%CE%CF%EB/album/item/57c8110a587d138d7acbe1a1.html圆周角哈
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![1.如图一.C、D、E是圆O上的点,AB为直径则角1+∠2=?2.如图二,AB为圆O直径,∠BOC=120°.CD⊥AB求∠ABD?图地址http://hi.baidu.com/%D7%B7%CB%DD%C3%CE%CF%EB/album/item/57c8110a587d138d7acbe1a1.html圆周角哈](/uploads/image/z/10762791-15-1.jpg?t=1.%E5%A6%82%E5%9B%BE%E4%B8%80.C%E3%80%81D%E3%80%81E%E6%98%AF%E5%9C%86O%E4%B8%8A%E7%9A%84%E7%82%B9%2CAB%E4%B8%BA%E7%9B%B4%E5%BE%84%E5%88%99%E8%A7%921%2B%E2%88%A02%3D%3F2.%E5%A6%82%E5%9B%BE%E4%BA%8C%2CAB%E4%B8%BA%E5%9C%86O%E7%9B%B4%E5%BE%84%2C%E2%88%A0BOC%3D120%C2%B0.CD%E2%8A%A5AB%E6%B1%82%E2%88%A0ABD%3F%E5%9B%BE%E5%9C%B0%E5%9D%80http%3A%2F%2Fhi.baidu.com%2F%25D7%25B7%25CB%25DD%25C3%25CE%25CF%25EB%2Falbum%2Fitem%2F57c8110a587d138d7acbe1a1.html%E5%9C%86%E5%91%A8%E8%A7%92%E5%93%88)
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