如图,将弧BC 沿弦BC折叠交直径AB于点D,若AD=5,DB=7,则BC的长是______ .
![](https://img.xkw.com/dksih/QBM/2013/2/18/1573601257316352/1573601380573184/STEM/9af7c48e9dbf4f6ab409c3931b8f2425.png?resizew=178)
更新时间:2016-12-05 08:03:06
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【知识点】 圆
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【推荐2】如图,在矩形
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于点E,以
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