如图,四棱锥
的底面是正方形,侧面PAD是正三角形,
,且侧面
底面ABCD,E为侧棱PD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/af8736a2-5fde-47e4-84ea-02347d4d679c.png?resizew=215)
(1)求证:
平面EAC;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/93edc7bb513f40a89173121c8570cd65.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/af8736a2-5fde-47e4-84ea-02347d4d679c.png?resizew=215)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acf2bc3dd1f1ae5d5e28b0366f454ec1.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d00bae294d76d2cfaf11520e20409c05.png)
更新时间:2022-02-21 15:10:38
|
相似题推荐
解答题-问答题
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容易
(0.94)
名校
解题方法
【推荐1】如下图,在三棱锥
中,
,
底面
,
,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/b4812039-36c5-4ef7-9892-aff3c9f98c4b.png?resizew=177)
(1)若
为
上一点,且
,证明:平面
平面
.
(2)若
为棱
上一点,且
平面
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c482ee1668a59ca21f3ae8b6bad58eae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21d2bbd2536b7adaebb38d6df3d1b1e6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7840070ecf04ae4831bf79989c4eccc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb77bfc351d1498ab4856c190b75b7d0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/b4812039-36c5-4ef7-9892-aff3c9f98c4b.png?resizew=177)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d320f180419175d75eebc618cc458b39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a26a7784c7419d8359fb119c8ecc03d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acc290b44635265137fdf13146b6a6d9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d8f3abe8876333c19ae7e36c98a9329b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8818e89658725962a7d6b0f49023e2f4.png)
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【推荐2】如图所示,三棱锥的顶点为P,PA,PB,PC为三条侧棱,且PA,PB,PC两两互相垂直,又PA=2,PB=3,PC=4,求三棱锥P-ABC的体积V.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/9/e265f331-d46d-4ccf-8a53-fee00bb71200.png?resizew=140)
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解答题-证明题
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【推荐1】如图,在三棱柱
中,
,点
,
分别是
,
的中点,平面
平面
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/d15fba4a-4074-4d04-98e2-bf2589b0c691.png?resizew=189)
(1)求证:
;
(2)求证:
//平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2aa712838a48f5c0cc909aa35a8d08f3.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/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/91ba5715a95b8de18c637c12c3d30d7d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/21/d15fba4a-4074-4d04-98e2-bf2589b0c691.png?resizew=189)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c453514d9c585d4f0c1bae2021eabb30.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/72f0d0e78101fef36a75b70ac7e7cf5b.png)
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【推荐2】如图,空间四边形ABCD中,E、F、G、H分别是AB、BC、CD、DA的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/e4579977-5ad7-4a4a-a81e-1f6e6f908e55.png?resizew=144)
求证:(1)EH∥平面BCD;
(2)BD∥平面EFGH.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/13/e4579977-5ad7-4a4a-a81e-1f6e6f908e55.png?resizew=144)
求证:(1)EH∥平面BCD;
(2)BD∥平面EFGH.
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【推荐1】如图,在四棱锥P﹣ABCD中,PA=PD,底面ABCD是矩形,侧面PAD⊥底面ABCD,E是AD的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/df77a801-7afd-46db-ba61-48fe18c07fef.png?resizew=148)
(1)求证:AD∥平面PBC;
(2)求证:AB⊥平面PAD
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/df77a801-7afd-46db-ba61-48fe18c07fef.png?resizew=148)
(1)求证:AD∥平面PBC;
(2)求证:AB⊥平面PAD
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解答题-问答题
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(0.94)
解题方法
【推荐2】如图,在四棱锥
中,平面
底面
,
,
,
,
.证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/712f7375b4ede5f75c0d81870c0f86af.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/712f7375b4ede5f75c0d81870c0f86af.png)
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