如图,直三棱柱
中,
,
,
分别是
,
的中点.
;
(2)若
,直线
与平面
所成的角为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13ba5383e768dc86e1bfd79c10f96f4d.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/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc90fee532e50d319081d571410421.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/209acf15985d1ea1ad86fc4a37e38c0b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d88591679796c52024d11c4de641bdb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3566e9a313d99422a62702a6ef6e93.png)
更新时间:2023-06-27 22:40:21
|
相似题推荐
解答题-问答题
|
适中
(0.65)
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解题方法
【推荐1】如图,在四棱锥
中,
,
,
.
(1)证明:
平面
;
(2)若
,
,
为线段
上一点,且
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4117625867a74cd022584500c76deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d028a62fea771beb2d18f0c1bf856c7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ca5087d262b2830846cb55fb32fbe5a.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a98c8e36238ad90378e724466fcb6023.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd08b502bf0d11788300e7d6ba2fc66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/acaf100147efc6dc6feb362be71a7132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4886e7a5981c939eb06b33ddb546346a.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/ba3ef8b0-71e2-4703-880e-7551c9de058d.png?resizew=184)
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【推荐2】在四棱锥
中,底面
是边长为
的正方形,
平面
,
.
![](https://img.xkw.com/dksih/QBM/2018/5/21/1950115284877312/1952334514069504/STEM/3d58b883d6fe495ca296c22544f3e57c.png?resizew=149)
(1)求四棱锥
的体积;
(2)求异面直线
与
所成角的大小.
![](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/b8860d9787671b53b1ab68b3d526f5ca.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/f566f6d9d8820c075a48eca82815de72.png)
![](https://img.xkw.com/dksih/QBM/2018/5/21/1950115284877312/1952334514069504/STEM/3d58b883d6fe495ca296c22544f3e57c.png?resizew=149)
(1)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e52a8f07834cbbbe4224962672fbbb2.png)
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【推荐3】如图,四棱锥P﹣ABCD的底面ABCD为直角梯形,BC//AD,且AD=2AB=2BC=2,∠BAD=90°,△PAD为等边三角形,平面ABCD⊥平面PAD;点E、M分别为PD、PC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/14fdb6b9-cda1-49fd-94c4-0c7851f348b4.png?resizew=213)
(1)证明:CE//平面PAB;
(2)求三棱锥M﹣BAD的体积;
(3)求直线DM与平面ABM所成角的正弦值.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/14fdb6b9-cda1-49fd-94c4-0c7851f348b4.png?resizew=213)
(1)证明:CE//平面PAB;
(2)求三棱锥M﹣BAD的体积;
(3)求直线DM与平面ABM所成角的正弦值.
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【推荐1】正方形
所在平面与三角形
所在平面相交于
,
平面
,且
,
.
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/c80508c4e28241ee97ec59aab060bcd0.png)
(1)求证:
平面
;
(2)求凸多面体
的体积.
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/7c805e25858e424f932acf3cd5d91a60.png)
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/5731b35c357c44d9887ce099e2a4e42a.png)
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/2ff0af78c33d49299a895ad8553880ed.png)
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/0d318e083fea44a182735609c57f64d6.png)
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/5731b35c357c44d9887ce099e2a4e42a.png)
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/c1400e9f6f3348fbbb45e9f67705090e.png)
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/1c5f1755f4d54270bcbd0ffdd64bb0ec.png)
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/c80508c4e28241ee97ec59aab060bcd0.png)
(1)求证:
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/5f99ef62c184488295e3dd42ce9234e7.png)
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/30c7d54c47cd4ee6af139599204c041f.png)
(2)求凸多面体
![](https://img.xkw.com/dksih/QBM/2015/6/4/1572119523704832/1572119604633600/STEM/65b96059ef2f4463a045f1fca8de7423.png)
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【推荐2】如图,在三棱锥
中,
平面ABD,E为AB的中点,
,
.证明:
平面CED;
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c3931333820859378ea6723ff3075189.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c01138acca46627f2dc26aeb95b4da9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5297879d1299eea7f20bbcbe3db75c21.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://img.xkw.com/dksih/QBM/2023/11/10/3365061816909824/3365910169149440/STEM/125e4a6c9342447a83c2e0e2e1574e46.png?resizew=193)
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【推荐3】在四棱锥
中,底面
为正方形,
平面
,
,点E,F分别为棱PB和PC上的点,且
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/84654656-26e4-4d73-83c5-6a9eacf4ef71.png?resizew=130)
(1)证明:
;
(2)若
,求平面AEF与平面AEC夹角的余弦值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbfbaf73297240eb116f22489519895a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f392902d611863c6908a48e696e7bd8f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/4/27/84654656-26e4-4d73-83c5-6a9eacf4ef71.png?resizew=130)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3b7b9bf7332256ac478041957fa2a55a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/00bab2c27eac56fffa4cd7dbe1dcdf1a.png)
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【推荐1】如图,在直三棱柱
中,底面是正三角形,点
是
中点,
,
.
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572484274831360/1572484280336384/STEM/5623bed318134e1abeb5c9832c95c15a.png?resizew=164)
(Ⅰ)求三棱锥
的体积;
(Ⅱ)证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.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/7bb5b12692517a39c320f99a479eb055.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1225db7039505351a11f64841ec0af2e.png)
![](https://img.xkw.com/dksih/QBM/2016/2/17/1572484274831360/1572484280336384/STEM/5623bed318134e1abeb5c9832c95c15a.png?resizew=164)
(Ⅰ)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7c224b2f296216e50a38cd465ea1077d.png)
(Ⅱ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e862713d078c4f06ec1f15ccd6f5a1f7.png)
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【推荐2】如图,在四棱锥
中,平面
平面
,
,
,
是边长为
的等边三角形,
是以
为斜边的等腰直角三角形,点
为线段
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/30f88b19-9060-44a2-8ef3-ae7b2e4e9b06.png?resizew=147)
(1)证明:
平面
;
(2)求直线
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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89b55ba8d91894b03c228a001eafaf9e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/14/30f88b19-9060-44a2-8ef3-ae7b2e4e9b06.png?resizew=147)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11d27ff0b39832f094ec51e28721d739.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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【推荐1】如图,已知四棱锥
,底面
为菱形,
平面
,
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/2020/12/1/2604893460463616/2609771291746304/STEM/f7fc31ab53b646cf9850c0027601f0bf.png?resizew=230)
(1)证明:
;
(2)若
为
上的动点,
,
与平面
所成最大角的正切值为
,求
的值.
![](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/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/26d4e574c9d139615d991a168cfbf63b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2020/12/1/2604893460463616/2609771291746304/STEM/f7fc31ab53b646cf9850c0027601f0bf.png?resizew=230)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/304e9d63e7fdc531f4f7b805b765a1b1.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/589786dd7c3a2679c3230b671cd232d6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/839c7616cd0d90265f4b2c9c021254fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
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【推荐2】如图,在三棱锥
中,
,
,
,点O是AC的中点,点P在线段MC上,
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941122068856832/2941970325708800/STEM/d02ee6ed-8ac3-4396-b1e7-06812695d5de.png?resizew=155)
(1)证明:
平面ABC;
(2)若
,直线AP与平面ABC所成的角为
,求二面角
的余弦值的大小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f5d90f940f5693b22ddf2e7c761887d8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86d6c8b46d3bac1335cfff31616f5748.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8520a21b909d04f763d0f61dd74bc158.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d11a5a756d8fdd7b294c4f5fd63467b.png)
![](https://img.xkw.com/dksih/QBM/2022/3/21/2941122068856832/2941970325708800/STEM/d02ee6ed-8ac3-4396-b1e7-06812695d5de.png?resizew=155)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab8a2ca644d9d7cdb4784a4fd28d3904.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9751ea1d1d9447230ac4d47839c138b8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c67d01e61dc0042e67b5e8ec8e727c22.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
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【推荐3】四棱锥
,底面为正方形
,边
为
中点,
平面
.
(1)若
为等边三角形,求三棱锥
的体积;
(2)若
的中点为
与平面
所成角为
,求
与
所成角的正切值.
![](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/a1ba61f50c7429166adadf8fa21c3627.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db807b09cc550f476b3f8fa0c6a14425.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/82867bb23bc067cce2848092c0222670.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bb6e5a7f3f5bf8e11ce978e69365578b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/30c20e88a33043f4279fff360c81006e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
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