如图,AB、CD是⊙O的弦,且AB//CD,AB=6,CD=4,AO=
.则
的度数是( )
![](https://img.xkw.com/dksih/QBM/2020/3/30/2430835259817984/2430880196763648/STEM/a692bc6f7df44f0c9da4a8b2fa2d07e6.png?resizew=124)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/50690dab38f4512eb72e18b7f86cf6f6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81caeba91259680cda37f0faa879b468.png)
![](https://img.xkw.com/dksih/QBM/2020/3/30/2430835259817984/2430880196763648/STEM/a692bc6f7df44f0c9da4a8b2fa2d07e6.png?resizew=124)
A.150° | B.160° | C.170° | D.180° |
19-20九年级上·浙江·期末 查看更多[2]
更新时间:2020-10-17 08:46:10
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【推荐1】如图,
,边
上有一点D,
,以点D为圆心,以
长为半径作弧交
于点E,则
( )
![](https://img.xkw.com/dksih/QBM/2021/3/4/2670835205849088/2676227391356928/STEM/13392edb-ebfa-4322-979e-c993182bae6c.png)
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A.![]() | B.4 | C.![]() | D.8 |
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【推荐2】如图所示的工件槽的两个底角均为
,尺寸如图(单位
),将形状规则的铁球放入槽内,若同时具有
,
,
三个接触点,则该球的半径是
.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/12/4ba96e87-b08d-4db1-a691-5bef76121d74.png?resizew=179)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b12d93bd1130088b622602a6c21c9c2d.png)
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A.10 | B.18 | C.20 | D.22 |
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