如图,在四棱锥
中,
是边长为
的棱形,且
分别是
的中点.
![](https://img.xkw.com/dksih/QBM/2017/10/4/1788207021146112/1788591060393984/STEM/df564f74172e44d3a5a6ce516b1f95b7.png?resizew=192)
(1)证明:
平面
;
(2)若二面角
的大小为
,求点
到平面
的距离.
![](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/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00f1f305ab2a9fbcefe71fe21b0403c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/52e13dcc51cd3a901cf25bd3c0d23588.png)
![](https://img.xkw.com/dksih/QBM/2017/10/4/1788207021146112/1788591060393984/STEM/df564f74172e44d3a5a6ce516b1f95b7.png?resizew=192)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87c0bfeadcf17b2a45896071f07a4a5a.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c911b404bbb8f8d5f1470585fa31ad97.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ac09dc1ca2cdd7aef28c218763d3e4d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
更新时间:2017-10-08 16:12:06
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解答题-证明题
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【推荐1】如图,已知三棱台
的体积为
,平面
平面
,
是以
为直角顶点的等腰直角三角形,且
,
平面
;
(2)求点
到面
的距离;
(3)在线段
上是否存在点
,使得二面角
的大小为
,若存在,求出
的长,若不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e57f00c8225a33458a6b62bff0dcc16.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/85a2e10a5aebe40a9018d5ee3ade7af8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.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/67fe4be64d44a1213970572a04eb5fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e2ffc6952e988d04f22f0fb2f7f0ab7b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f637bf133818d36ad04ce78d3a6cc80.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/037fb348109dc2063a268b10eb925a57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4cae70b8a9d2d2e96dea62c00ced04b9.png)
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【推荐2】如图,平面
平面
,四边形
和
是全等的等腰梯形,其中
,且
,点
为
的中点,点
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/83e26f2d-55bf-430d-ba81-1afe0ee799a7.png?resizew=220)
(1)请在图中所给的点中找出两个点,使得这两个点所在直线与平面
垂直,并给出证明 ;
(2)求二面角
的余弦值;
(3)在线段
上是否存在点
,使得
?如果存在,求出
的长度,如果不存在,请说明理由.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d53aeabf77688e80280d23d766b4c45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf8be22425679fbdc28350119f68c274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61ba6f4177822927b5875b92cd5f2038.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf8be22425679fbdc28350119f68c274.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ab51fc49d74110a334e2bd6b6148797.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47ee278ec8164c0ca89b79d707a72732.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/735056c174e8dd7906257a2a50a962a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/12/83e26f2d-55bf-430d-ba81-1afe0ee799a7.png?resizew=220)
(1)请在图中所给的点中找出两个点,使得这两个点所在直线与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb093f3dfd9b79be8fd6be9f202e27dd.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1105dc7a3bae6e74641fa653cfae0aa8.png)
(3)在线段
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e7e9d0055901f6a4b2e22503e314072.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
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解答题-作图题
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【推荐3】我国古代数学名著《九章算术》中,将底面为直角三角形且侧棱垂直于底面的三棱柱称之为堑堵;将底面为矩形且一侧棱垂直于底面的四棱锥称之为阳马;将四个面均为直角三角形的四面体称之为鳖臑[biē nào].某学校科学小组为了节约材料,拟依托校园内垂直的两面墙和地面搭建一个堑堵形的封闭的实验室
,
是边长为2的正方形.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/45fde4d8-c125-4b27-aef1-9044ed46e1e8.png?resizew=377)
(1)若
是等腰三角形,在图2的网格中(每个小方格都是边长为1的正方形)画出堑堵的三视图;
(2)若
,
在
上,证明:
,并回答四面体
是否为鳖臑,若是,写出其每个面的直角(只需写出结论);若不是,请说明理由;
(3)当阳马
的体积最大时,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9b7b7793d29d66dfdd89e7a6564a35c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/20/45fde4d8-c125-4b27-aef1-9044ed46e1e8.png?resizew=377)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6a543df08305d4a848a980969bb002a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bdcec400a6a9311072505df48fb0fd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f22725912baecf50924d950b915d0156.png)
(3)当阳马
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb1b9bf22bd3ca350a2651a7550e8ba1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
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解题方法
【推荐1】如图,在四棱锥
中,底面ABCD是边长为2的菱形,△PAD为等边三角形,平面
平面ABCD,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/a7f0efaa-170b-4503-aa7b-c059787e26ae.png?resizew=208)
(1)求点A到平面PBC的距离;
(2)E为线段PC上一点,若直线AE与平面ABCD所成的角的正弦值为
,求平面ADE与平面ABCD夹角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0063f3f48e49f2970ec7f097567cef5.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/12/a7f0efaa-170b-4503-aa7b-c059787e26ae.png?resizew=208)
(1)求点A到平面PBC的距离;
(2)E为线段PC上一点,若直线AE与平面ABCD所成的角的正弦值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/38cb57b942813635ef4e4c3bea67928f.png)
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解答题-证明题
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解题方法
【推荐2】如图,在四棱锥
中,
底面
,底面
是直角梯形,
,
点在
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/ae75f800-ed5a-42a4-9225-4a7a6c44820e.png?resizew=135)
(1)已知点
在
上,且
,求证:平面
平面
.
(2)求点
到平面
的距离.
(3)当二面角
的余弦值为多少时,直线
与平面
所成的角为
?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.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/90ff6d7dd48b57f03d82d2c522ee9b94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57af6716734f5c1b63a9376712fcfbc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45ab1959f7fa560977ffb9fb0e11bb2c.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/27/ae75f800-ed5a-42a4-9225-4a7a6c44820e.png?resizew=135)
(1)已知点
![](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/8f0ce7aaca2b6725dac7ed5d2a437aa1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f020ca4ad44801691235958e253907d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(3)当二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce81faef7c631553e02d7468973a74cd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f1e5fa72f2878b476bc57f0df12d6555.png)
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