如图,已知圆锥的顶点为
,底面圆心为
,高为3,底面半径为2.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/8cd31260-ae23-4c7c-8853-344c546e622e.png?resizew=166)
(1)求该圆锥侧面展开图的圆心角;
(2)设
、
为该圆锥的底面半径,且
,
为线段
的中点,求直线
与直线
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/2/8cd31260-ae23-4c7c-8853-344c546e622e.png?resizew=166)
(1)求该圆锥侧面展开图的圆心角;
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55b9931cfb6a0ba33cb6e11e569a8cee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/892909e49156f7dcc0650fcd65243877.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b90e0f35eda1a729fed485f83da5ea9d.png)
更新时间:2024-03-03 10:32:47
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【推荐1】图①是高桥中学的校门,它由上部屋顶,和下部两根立柱组成,如图②,屋顶由四坡屋面构成,其中前后两坡屋面
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【推荐1】亭子是一种中国传统建筑,多建于园林、佛寺、庙宇,人们在欣赏美景的同时也能在亭子里休息、避雨、乘凉(如图1).我们可以把亭子看成由一个圆锥
与一个圆柱
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![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/94ba2314-0c0f-429e-a721-aa1ccfdaaef5.png?resizew=354)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32fb50c66cd2de786b39cb442ec54a16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/1/94ba2314-0c0f-429e-a721-aa1ccfdaaef5.png?resizew=354)
(1)求圆锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/32fb50c66cd2de786b39cb442ec54a16.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
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【推荐2】一个圆锥的底面半径为2cm,高为6cm,在其内部有一个高为x cm的内接圆柱.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/bce50428-f440-4d63-8110-e930a6124602.png?resizew=104)
(1)求圆锥的体积;
(2)当x为何值时,圆柱的侧面积最大?并求出侧面积的最大值.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/13/bce50428-f440-4d63-8110-e930a6124602.png?resizew=104)
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【推荐1】如图所示,在
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![](https://img.xkw.com/dksih/QBM/2022/1/17/2896491209203712/2897153509335040/STEM/f423cc41-560e-4af9-bbbe-32bdd5067b5f.png?resizew=117)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c633830c6e2ac6d8d6e18890ef5ee33.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d815221955a96bf6f621ac979c443c.png)
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(1)求直线CD与OA所成角的余弦值;
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【推荐2】如图,四面体ABCD中,O是BD的中点,CA=CB=CD=BD=2,AB=AD=
.
(1)求证:AO⊥平面BCD;
(2)求异面直线AB与CD所成角的大小;
(3)求二面角O﹣AC﹣D的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
(1)求证:AO⊥平面BCD;
(2)求异面直线AB与CD所成角的大小;
(3)求二面角O﹣AC﹣D的大小.
![](https://img.xkw.com/dksih/QBM/2018/12/23/2103012073267200/2106959029952512/STEM/d1fd19ac80054b50b3dfd91bbbd101cf.png?resizew=203)
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