已知:如图,AB是⊙O的弦,⊙O的半径为10,OE、OF分别交AB于点E、F,OF的延长线交⊙O于点D,且AE=BF,∠EOF=60°.
![](https://img.xkw.com/dksih/QBM/2013/9/11/1573681787658240/1573681793589248/STEM/35fec611a09c4c5c9716d317257c0d88.png?resizew=137)
(1)求证:△OEF是等边三角形;
(2)当AE=OE时,求阴影部分的面积.(结果保留根号和π)
![](https://img.xkw.com/dksih/QBM/2013/9/11/1573681787658240/1573681793589248/STEM/35fec611a09c4c5c9716d317257c0d88.png?resizew=137)
(1)求证:△OEF是等边三角形;
(2)当AE=OE时,求阴影部分的面积.(结果保留根号和π)
更新时间:2016-12-05 18:46:42
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【推荐2】(1)问题提出:如图1,四边形
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(2)问题解决:某公园计划修建主题活动区域,如图2,
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