如图,四棱锥
的底面是边长为2的菱形,
,对角线AC与BD相交于点O,
平面ABCD,PB与底面ABCD所成角为
,点E是PB的中点.
(1)证明:
平面PAD;
(2)求点E到平面PAD的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d02bd5cfe804460846423e77f72db10f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7fccaf36651e0ac62b3ccf9edd74372a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84ad334c6d980f01aaa3bf6be547a7fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3ad1b0a76a887783392268ae203ad22.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/1/9ff50cd1-5ffe-469c-beaf-fbb9b49f54d3.png?resizew=164)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4610344fed3177e36cdf9cdf11e81e4.png)
(2)求点E到平面PAD的距离.
23-24高二上·广东惠州·期中 查看更多[2]
更新时间:2023-11-09 23:09:19
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解答题-证明题
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【推荐1】如图,在三棱锥
中,
分别为棱
上的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/7b55a1a6-6a9b-43c3-a55b-53f050379129.png?resizew=193)
(1)求证:
平面
;
(2)若
平面
,求证:平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/891579e7c231584a8e16b8eeff79888e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/481e426224c3a3ce9bb5a731eed81c40.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/30/7b55a1a6-6a9b-43c3-a55b-53f050379129.png?resizew=193)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f16835e3f230ba3f543b6804e445e283.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7abd284f76d9f5769bc189508ce2572b.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ee25c6a2ae09bfb37d9f48dff69b102.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca67a5b8f69507c8b80379e86f90a8ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6501f1c913a4ef64957a2f01ab5baa15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
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【推荐2】如图1,矩形
中,
,M是
边上异于端点的动点,
于点N,将矩形
沿
折叠至
处,使面
面
(如图2).点E,F满足
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/91c9d39e-9f7e-4d41-9157-5376b9d05328.png?resizew=453)
(1)证明:
面
;
(2)设
,当x为何值时,四面体
的体积最大,并求出最大值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9639896487e6cf18e8fd02d2a7ed2087.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aab384f2520d76ed8fa01b31e09c1eea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b80a0e428cb894bfd09a6129a73ea4ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411461db15ee8086332c531e086c40c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29a47ca365469c996a6b8cb47284764f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46efd4004cc47ba16d3d53b07d40b145.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f0e825de4e5ade72e45a28c8f75b1dea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23b04eeb552bee53eda166bfb2b85578.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/5/91c9d39e-9f7e-4d41-9157-5376b9d05328.png?resizew=453)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9afac7c616bbb14e1ed428a3c507c7dc.png)
(2)设
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e787bb792dcd936cb4e87023c95011b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f780ed359b94450fc80cf57e66a4ad8.png)
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解题方法
【推荐1】如图,四棱锥
中,底面
为菱形,且
,侧棱
底面
,
,
为侧棱
上一点.
![](https://img.xkw.com/dksih/QBM/2021/12/17/2874618954555392/2878868775985152/STEM/cb95347a-49d2-4207-a1be-0bb5b205ef92.png?resizew=226)
(1)当
为
中点时,求
的面积;
(2)试确定点
的位置,使平面
与平面
夹角的余弦值为
.
![](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/e075468e7fb0bf30229aec01a7205977.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/d9a4950a6e4202efd609507964af238b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://img.xkw.com/dksih/QBM/2021/12/17/2874618954555392/2878868775985152/STEM/cb95347a-49d2-4207-a1be-0bb5b205ef92.png?resizew=226)
(1)当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efb82d496588a371ebd342428a5b402d.png)
(2)试确定点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f35614aff055b98b76ca262f64e629d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa742541365f6884ef33a337569fe13b.png)
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解答题-问答题
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解题方法
【推荐2】如图,在四棱锥P-ABCD中,底面ABCD为矩形,侧棱PA⊥底面ABCD,AB=
,BC=1,PA=2,E为PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/242e6cf6-147d-432d-b7f1-48ac8a6bcbae.png?resizew=183)
(1)求异面直线
与
间的距离;
(2)在侧面PAB内找一点N,使
平面
,并求出N到AB和AP的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/8/242e6cf6-147d-432d-b7f1-48ac8a6bcbae.png?resizew=183)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
(2)在侧面PAB内找一点N,使
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d6c7f7ffbb802aef097bbe1a9321691f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
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