如图,AB是⊙O的直径,CD是⊙O的一条弦,且CD⊥AB于E,连接AC,OC,BC.
![](https://img.xkw.com/dksih/QBM/2021/12/2/2863958330957824/2871610434568192/STEM/35c1e53156284d7a89c3acfbad84551f.png?resizew=169)
(1)求证:∠1=∠2;
(2)若
,求⊙O的半径的长.
![](https://img.xkw.com/dksih/QBM/2021/12/2/2863958330957824/2871610434568192/STEM/35c1e53156284d7a89c3acfbad84551f.png?resizew=169)
(1)求证:∠1=∠2;
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/994190706f77be0bca7a2431228ef51a.png)
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更新时间:2021-12-13 13:29:17
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【推荐1】要把残破的图形模具修复完整,已知弧上三点
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【推荐2】如图所示,已知
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd4163013ce2054e7deaa65ff70561b4.png)
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【推荐3】如图1是博物馆展出的古代车轮实物,《周礼·考工记》记载:“……故兵车之轮六尺有六寸,田车之轮六尺有三寸……”据此,我们可以通过计算车轮的半径来验证车轮类型,请将以下推理过程补充完整.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/19ee72f2-8cf1-48b6-b236-db57c1a5ad87.png?resizew=304)
如图2所示,在车轮上取A,B两点,设
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作弦AB的垂线OC,D为垂足,则
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经测量,
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___________
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___________
.
在
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___________.解得
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通过换算,车轮直径约为六尺六寸,可验证此车轮为___________之轮.(填“兵车”或“田车”)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/25/19ee72f2-8cf1-48b6-b236-db57c1a5ad87.png?resizew=304)
如图2所示,在车轮上取A,B两点,设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16d65cecaf8a3dc2953f4109c75a981e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0c07dd76464ea18d68f58a2e02b58ee.png)
作弦AB的垂线OC,D为垂足,则
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在
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通过换算,车轮直径约为六尺六寸,可验证此车轮为___________之轮.(填“兵车”或“田车”)
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【推荐2】如图,
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