如图,在长方体
中,
,
和平面
所成的角为
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/2b232c6b-5f41-40d9-b53f-5b3daa38cb6b.png?resizew=141)
(1)求该长方体的体积;
(2)求异面直线
与
所成角的大小(结果用反三角函数值表示).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa1c07becd03537beeb09a31745cf5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c40479fd1c7c8fee25360c43ea9db00.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/31/2b232c6b-5f41-40d9-b53f-5b3daa38cb6b.png?resizew=141)
(1)求该长方体的体积;
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
更新时间:2019-12-08 15:40:09
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解答题-作图题
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【推荐1】如图.已知几何体的三视图(单位:
).
![](https://img.xkw.com/dksih/QBM/2021/11/18/2853843550601216/2859050132791296/STEM/6744d7de-cef2-4fd6-bbb2-ecd5ae9ea7f5.png?resizew=209)
(1)画出它的大致直观图(不要求写画法);
(2)求这个几何体的表面积和体积.(结果用π保留)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9efa9fbcfb9595e2f031aa691db4564b.png)
![](https://img.xkw.com/dksih/QBM/2021/11/18/2853843550601216/2859050132791296/STEM/6744d7de-cef2-4fd6-bbb2-ecd5ae9ea7f5.png?resizew=209)
(1)画出它的大致直观图(不要求写画法);
(2)求这个几何体的表面积和体积.(结果用π保留)
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【推荐2】如图,圆锥的底面直径和高均是4,过
的中点
作平行于底面的截面,以该截面为底面挖去一个圆柱.
![](https://img.xkw.com/dksih/QBM/2021/1/24/2642995387596800/2644934963830784/STEM/9b56ce19-f4f8-4f61-860a-ccbf27f67118.png?resizew=157)
(1)求该圆锥的表面积;
(2)求剩余几何体的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12fe32dfbd66709875c5b9f79c9496da.png)
![](https://img.xkw.com/dksih/QBM/2021/1/24/2642995387596800/2644934963830784/STEM/9b56ce19-f4f8-4f61-860a-ccbf27f67118.png?resizew=157)
(1)求该圆锥的表面积;
(2)求剩余几何体的体积.
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解答题-问答题
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解题方法
【推荐1】如图所示,设有底面半径为
的圆锥.已知圆锥的侧面积为
,
为
中点,
.
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992893777698816/2998881124327424/STEM/2adc83bea7004804bf605cbfc40f6cf7.png?resizew=149)
(1)求圆锥的体积;
(2)求异面直线
与
所成角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5ca7d1107389675d32b56ec097464c14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce7da0bd11533e2a6096272e372f467d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89a9c9c14366b45e71105a07f3775bb9.png)
![](https://img.xkw.com/dksih/QBM/2022/6/2/2992893777698816/2998881124327424/STEM/2adc83bea7004804bf605cbfc40f6cf7.png?resizew=149)
(1)求圆锥的体积;
(2)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
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【推荐2】如图,在棱长为1的正方体
中:
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/fbe9c2f1-0922-477a-b04f-03e6d3f228ab.png?resizew=171)
(1)求异面直线
与
所成的角的大小;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/15/fbe9c2f1-0922-477a-b04f-03e6d3f228ab.png?resizew=171)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d77c3fbb8e9bec217f51110f4fe2021d.png)
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解答题-证明题
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【推荐1】如图,四棱锥
的底面
是边长为2的正方形,平面
平面
,
是斜边
的长为
的等腰直角三角形,
,
分别是棱
,
的中点,
是棱
上一点.
![](https://img.xkw.com/dksih/QBM/2021/8/28/2796113323352064/2798969608798208/STEM/22b396ae-e112-4764-8166-f0d18e1a2934.png?resizew=227)
(1)求证:平面
平面
;
(2)若直线
与平面
所成角的正切值为
,求锐二面角
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/93edc7bb513f40a89173121c8570cd65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55a675310c8ba418e5a59beb7317e21e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95bacae35b6e16a0a33c2bdc6bc07df7.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/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/2021/8/28/2796113323352064/2798969608798208/STEM/22b396ae-e112-4764-8166-f0d18e1a2934.png?resizew=227)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/62cce4195e4e9045821a4a9e79a151cc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/907d5147cea4c9ce855074864fe54506.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edbb52befa94a9f54e6f3e3125918016.png)
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【推荐2】如图,在四棱锥
中,底面
是边长为2的菱形,
是
边的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/69a2464a-232c-40a4-b8e6-87cfb5611827.png?resizew=144)
(1)求证:
平面
;
(2)若直线
与底面
所成的角为
,求二面角
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/b19481882bfdc390d06386f1797792b6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/69a2464a-232c-40a4-b8e6-87cfb5611827.png?resizew=144)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b37793a3a810e823e10c340986f55ddd.png)
(2)若直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d399d731913a563e291b817831a0c678.png)
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解答题-问答题
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【推荐3】如图,四棱锥
中,底面
为矩形,
⊥平面
,
为
的中点.
平面
;
(2)设直线
与底面
所成角的正切值为
,
,
,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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](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/e0629ce42392a7fe9be21d25c39c3e64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa0651af49ab42b58098873b46975650.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46e2da608b66c9aee03e2503388ba4fd.png)
(2)设直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf31876698721a199c7c53c6b320aa86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98823cbc09ca52df1fbcc446eba3e44f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d783fe7f3ce673d5d21281174e7a7968.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
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