如图,
是
的直径,且
,
是
上一点,
,则
的度数为________ ,以扇形
为侧面的圆锥,它的底面圆的周长是________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45fed79f92e159959c609b775300bef3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63c5beba9877bf55ec0ed1a8f2aa4ba6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3818a2c9919d358b4c3713396093822b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa3a310c1f8a5af35dc3328d874e18e.png)
![](https://img.xkw.com/dksih/QBM/2020/6/7/2479467764817920/2480369288306688/STEM/6af3e989cafa489bb7739f7e4fe024db.png?resizew=113)
更新时间:2020-06-21 21:37:52
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【推荐2】如图,
是
的弦,C是
上的一点,且
,
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于点D.若
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【推荐1】如图,扇形纸扇完全打开后,阴影部分为贴纸,外侧两竹条AB,AC的夹角为120°,弧BC的长为30
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【推荐2】将一个圆放在两条平行线中间,无论这个圆如何运动,始终与这两条平行线相切,我们将圆的这种性质称为定宽性. 除了圆之外,勒洛三角形也具有定宽性,它是分别以等边三角形的三个顶点为圆心,以边长为半径,在另两个顶点间画一段圆弧,三段圆弧围成的曲边三角形. 若圆的半径为2,则图中的勒洛三角形的周长为_______________ .
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