如图,已知四边形
是圆柱
的轴截面,点
在上底面圆上,点
为
的中点,
.若圆柱的底面圆半径为2,侧面积为
,则异面直线
与
所成角的余弦值为( )
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723895365468160/2723929851682816/STEM/521a4873-9031-457c-8171-143af6475627.png?resizew=180)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08f57b8380e1c9d059087e2bd121153f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12e0166cef87d437ba03524bbdb61288.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/68a83fdd2ba72a2dba0b6b10bb3e06b9.png)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2723895365468160/2723929851682816/STEM/521a4873-9031-457c-8171-143af6475627.png?resizew=180)
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2021·全国·模拟预测 查看更多[3]
更新时间:2021-05-18 21:52:22
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【推荐1】我国南宋著名数学家秦九韶发现了“三斜”求职公式,即
的三个内角
所对的边分别为
,则
的面积
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,则
面积的最大值为( )
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c609ec5c5c2d253fb524103f834de9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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【推荐2】如图,梯形
顶点
在以
为直径的半圆上,
米,若电热丝由三条线段
这三部分组成,在
上每米可辐射
单位热量,在
上每米可辐射2单位热量,当电热丝辐射的总热量最大时,
的长度为 ( )
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/25/c313b06a-cff1-4235-b664-ef3c10038991.png?resizew=224)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】已知一个几何体的三视图如下图所示,则此几何体的表面积为
![](https://img.xkw.com/dksih/QBM/2018/6/4/1959861774082048/2022246740115456/STEM/6ec976280f6f4bb4915b1c567765c1f1.png?resizew=462)
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【推荐2】已知圆锥SO,其侧面展开图是半圆,过SO上一点P作平行于圆锥底面的截面,以截面为上底面作圆柱PO,圆柱的下底面落在圆锥的底面上,且圆柱PO的侧面积与圆锥SO的侧面积的比为
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【推荐1】在长方形ABCD中,AB=2AD,过AD,BC分别作异于平面ABCD的平面
,
,若
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【推荐2】如图,已知底面为直角三角形的直三棱柱
,其三视图如图所示,则异面直线
与
所成角的余弦值为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/a626698f-e7f9-4749-b46c-a1fb3eb22fc8.png?resizew=273)
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