在三棱锥S—ABC中,△ABC是边长为2的等边三角形,∠SCA=90°,D为SA的中点,SC=BD=2.
![](https://img.xkw.com/dksih/QBM/2022/2/15/2916953539936256/2923569073471488/STEM/0b752edc-f087-45cb-9b28-3a80fb2af3f0.png?resizew=122)
(1)如图,过BD画出三棱锥S—ABC的一个截面,使得这个截面与侧面SAC垂直,并进行证明;
(2)求(1)中的截面将三棱锥S—ABC分割成两个棱锥的体积之比.
![](https://img.xkw.com/dksih/QBM/2022/2/15/2916953539936256/2923569073471488/STEM/0b752edc-f087-45cb-9b28-3a80fb2af3f0.png?resizew=122)
(1)如图,过BD画出三棱锥S—ABC的一个截面,使得这个截面与侧面SAC垂直,并进行证明;
(2)求(1)中的截面将三棱锥S—ABC分割成两个棱锥的体积之比.
2022·四川宜宾·模拟预测 查看更多[3]
四川省宜宾市高县中学2021-2022学年高三下学期高考适应性考试文科数学试题(已下线)重难点03 立体几何与空间向量-2022年高考数学【热点·重点·难点】专练(全国通用)(已下线)专题突破卷20立体几何的截面问题-2
更新时间:2022-02-24 23:19:25
|
相似题推荐
解答题-问答题
|
较易
(0.85)
名校
解题方法
【推荐1】如图,在三棱锥
中,
,O是
的中点,
,
.
![](https://img.xkw.com/dksih/QBM/2021/1/18/2638955185750016/2641471786500096/STEM/153a4f3af4ff489181b7bf0620739748.png?resizew=241)
(1)证明:
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6785cd48756ef330758ede84c0964b3d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d47fa5c5804385e2c2ab8279a7fee677.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c435dfe74d9cc4d14803ad4419eb116.png)
![](https://img.xkw.com/dksih/QBM/2021/1/18/2638955185750016/2641471786500096/STEM/153a4f3af4ff489181b7bf0620739748.png?resizew=241)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bbd7c2767c106faf27d6a97ebc8e739.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bf9718967af7a01c5b4866ea6f73bbb.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
解题方法
【推荐2】如图,在三棱锥
中,已知
是正三角形,
平面
为
的中点,
在棱
上,且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/0753da9a-35a4-460b-ac49-4e9138678b98.png?resizew=194)
(1)求三棱锥
的体积;
(2)求证:
平面
;
(3)若
为
中点,
在棱
上,且
,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f010b76578240c9efbbe0bc173d24714.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/21f9157fce2a8339d281178c7c0bccbe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee283c8b16bb83aa6119be01186bcf0d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/457eb716c608c6b4fb6e91c8fc2ed163.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/7/0753da9a-35a4-460b-ac49-4e9138678b98.png?resizew=194)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e56fdf217165748fafe938b64fa08179.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(3)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d97dc3b752832906de41447bb58a341.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2239d3ef65845a7855c84932428bf079.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1eaa5e336f830a3e5cd60ff7a756f3ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
您最近一年使用:0次
解答题-证明题
|
较易
(0.85)
名校
解题方法
【推荐1】如图,底面ABCD是边长为2的菱形,
,
平面ABCD,
,
,BE与平面ABCD所成的角为
.
![](https://img.xkw.com/dksih/QBM/2020/4/8/2436965338128384/2437660892831744/STEM/e6179f0afbda49538eab9d334a078cce.png?resizew=265)
(1)求证:平面
平面BDE;
(2)求二面角B-EF-D的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b56417f6b2f1fc1a45c8c528bdce9d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a3ae72e7e4d456f262d498b2a2f4473.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/79a97bb4dcfab4ec7539bc783d563c49.png)
![](https://img.xkw.com/dksih/QBM/2020/4/8/2436965338128384/2437660892831744/STEM/e6179f0afbda49538eab9d334a078cce.png?resizew=265)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e51838e395dfc9d9ef597d9e01f46272.png)
(2)求二面角B-EF-D的余弦值.
您最近一年使用:0次
解答题-问答题
|
较易
(0.85)
解题方法
【推荐2】如图,几何体ABCDEF中,矩形CDEF所在平面与梯形ABCD所在平面互相垂直,
,
,
,H为AB的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/1614a761-2f7a-4831-b0cf-94b0561f517b.png?resizew=123)
(1)证明:平面
平面CFH;
(2)若几何体ABCDEF的体积为4,求CF.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08062a925efb07c38a229b8628e3b41f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a11029ca6b4b9e7f777af0280cf163c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea4f5eec0addba78f2e0cdfb7ecc59a6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/30/1614a761-2f7a-4831-b0cf-94b0561f517b.png?resizew=123)
(1)证明:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15f3e3f310f6ec3f3a26498e7ee17a00.png)
(2)若几何体ABCDEF的体积为4,求CF.
您最近一年使用:0次