已知下图是四面体
及其三视图,
是
的中点,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/9a4a1c82-7818-41b4-afe7-329222729f55.png?resizew=409)
(1)求四面体
的体积;
(2)求
与平面
所成的角;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/5/9a4a1c82-7818-41b4-afe7-329222729f55.png?resizew=409)
(1)求四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
2019·上海虹口·三模 查看更多[3]
更新时间:2019-08-21 22:21:28
|
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解答题-作图题
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适中
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解题方法
【推荐1】已知某组合体的三视图如图所示.
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(1)说明该几何体由那些简单几何体组成,并画出立体图形;
(2)求该几何体的表面积和体积.
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(1)说明该几何体由那些简单几何体组成,并画出立体图形;
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解答题-作图题
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适中
(0.65)
名校
解题方法
【推荐2】一几何体按比例绘制的三视图如图所示(单位:
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/24/c0bd6ffe-0378-47cf-8be4-a9b463270abc.png?resizew=196)
(1)试画出它的直观图(不写作图过程);
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e15e00f40396e914d1d9955bd7785f1f.png)
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(1)试画出它的直观图(不写作图过程);
(2)求它的表面积和体积.
您最近一年使用:0次
解答题-问答题
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适中
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解题方法
【推荐1】如图,在正方体
中,
,
,
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(2)求三棱锥
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d2c15801fee2405573677484f5dcfa4.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8bc5d8308a060d6068cfc9f69fe79e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ae8768996ca9a0f2c5d9a19abbd54df.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05479ce59da01ea9c5bef3f20efadb41.png)
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【推荐2】如图所示,已知圆锥的底面半径
,经过旋转轴AO的截面是等边三角形SAB,点Q为半圆弧AB的中点,点P为母线SA的中点.
(2)求异面直线PQ与SO所成角的大小;
(3)若一只蚂蚁从Q点沿着圆锥的侧表面爬至P点,请你能否作出合情的假设,来估算该蚂蚁行程的最小值(精确到0.01m).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cc993c364d8514246b493bcbec7fb90.png)
(2)求异面直线PQ与SO所成角的大小;
(3)若一只蚂蚁从Q点沿着圆锥的侧表面爬至P点,请你能否作出合情的假设,来估算该蚂蚁行程的最小值(精确到0.01m).
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解答题-证明题
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适中
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名校
解题方法
【推荐1】如图,在直四棱柱
中,
平面
,底面
是菱形,且
,E是BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/d5b299b6-b726-4151-92c1-2a142c6109ee.png?resizew=159)
(1)求证:
平面
;
(2)求证:直线
平面
;
(3)求直线
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8bfe2553e852df73185d017c0a62fb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a69138b166b2a53d994189c8eb29358.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/17/d5b299b6-b726-4151-92c1-2a142c6109ee.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f11f1840eb8b17e7b07c3fe7e987a9c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/64eb66e4fa5ca4231b8ce2490eeb192b.png)
(2)求证:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f96c673a2381f118ea2d3efc0bca1f3.png)
(3)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b808a8facf9af30cd8a083010a7b850d.png)
您最近一年使用:0次
解答题-证明题
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适中
(0.65)
解题方法
【推荐2】如图,已知矩形
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,
平面
,
,
,
,
、
分别是
、
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/3bf1bebf-ca5b-482b-af21-a1dd013a6bff.png?resizew=159)
(1)求证:
;
(2)求
与平面
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b80ee363635d73f601654339028daec.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/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/3bf1bebf-ca5b-482b-af21-a1dd013a6bff.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/316c97c5b6f7c0fbdf7b9e4b9fccb661.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐3】如图,在四棱锥
中,底面
是正方形,
面
,
,
分别为
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/2a034f0d-3312-4c4f-8115-761ca2ee7742.png?resizew=182)
(1)证明:直线
平面
;
(2)求
与平面
所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c20600902262b78f9bf0813a3e28c6de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0b199a99e53d67ff4abf233930961a29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7289f91e2b5041cf4efb4ff7a9d34def.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/2a034f0d-3312-4c4f-8115-761ca2ee7742.png?resizew=182)
(1)证明:直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/776fafdf6c6d9650c9be1a8934082eca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
您最近一年使用:0次