在
中,斜边
,
.将
绕点
按顺时针方向旋转
,顶点C运动的路线长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32436704a722d5e568ff5c175bf3c662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
A.![]() | B.![]() | C.π | D.![]() |
更新时间:2023-12-02 21:01:51
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【推荐1】如图∠BAC=60°,半径长1的⊙O与∠BAC的两边相切,P为⊙O上一动点,以P为圆心,PA长为半径的⊙P交射线AB、AC于D、E两点,连接DE,则线段DE长度的最大值为( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/10/836dd061-c33e-49c6-9dd9-b17d595d4bb6.png?resizew=165)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/10/836dd061-c33e-49c6-9dd9-b17d595d4bb6.png?resizew=165)
A.3 | B.6 | C.![]() | D.![]() |
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【推荐2】如图,点
是
的平分线
上一点,
于点
,且
,
,有一点
在边
上运动,当运动到某一位置时
面积恰好是
面积的2倍,则此时
的长是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7cbce11aa19b8bd2bf6ee5a834e005de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5bc56fdf70e65bd88980c64af96b83da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d3c34fe8c99745f61e57db23bbdb1e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b57fdd2a3642716fcf5100011eb3ec88.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/240c3dde29cec7d59e954a1a25a77f8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3f10d25920f9d3077d8e3e5e006c15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6aa2b5e09f8ec785c59900a529390a02.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/8/15/7b341cc6-9b1c-4157-a981-70dbf9ee0cf0.png?resizew=204)
A.6 | B.![]() | C.4 | D.![]() |
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【推荐1】如图(十三),扇形AOB中,
=10, ÐAOB=36°.若固定B点,将此扇形依顺时针方向旋转,得一新扇形A’O’B,其中A点在
上,如图(十四)所示,则O点旋转至O’点所经过的轨迹长度为何?( )
![](https://img.xkw.com/dksih/QBM/2010/12/16/1574128487071744/1574128603758592/STEM/9aee6ce8a1314ab9875c6466f1b2c56d.png?resizew=356)
![](https://img.xkw.com/dksih/QBM/2010/12/16/1574128487071744/1574128603758592/STEM/7f5f7ca9b5804a349580e0c2dfef8393.png?resizew=24)
![](https://img.xkw.com/dksih/QBM/2010/12/16/1574128487071744/1574128603758592/STEM/99de00d825284f04835ec50c46897e00.png?resizew=29)
![](https://img.xkw.com/dksih/QBM/2010/12/16/1574128487071744/1574128603758592/STEM/9aee6ce8a1314ab9875c6466f1b2c56d.png?resizew=356)
A.![]() | B.2![]() | C.3![]() | D.4![]() |
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【推荐2】如图(甲),水平地面上有一圆心角为60°的扇形OAB,其中OA的长度为6cm,且与地面垂直,若在没有滑动的情况下,将图(甲)的扇形向右滚动至OB与地面垂直为止,如图(乙)所示,则点O移动的距离是( )
![](https://img.xkw.com/dksih/QBM/2019/1/9/2115118577770496/null/STEM/f6d8755deda24901ba00a9b392782b83.png?resizew=283)
![](https://img.xkw.com/dksih/QBM/2019/1/9/2115118577770496/null/STEM/f6d8755deda24901ba00a9b392782b83.png?resizew=283)
A.6 cm | B.![]() | C.![]() | D.![]() |
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