已知
是圆锥
的底面直径,C是底面圆周上的一点,
,平面
和平面
将圆锥截去部分后的几何体如图所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/ebb26a22-b021-4be1-82e4-8358117bcf72.png?resizew=153)
(1)证明:
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/006da854daaec2ed7b17388f640057bd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0628681907ac8d7fdb94d8bc1b15feb9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/16/ebb26a22-b021-4be1-82e4-8358117bcf72.png?resizew=153)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f6d39135a2f8472d66ea00eda3b13ab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b33b7213d99a817bff19bcf740a0697c.png)
23-24高三上·江苏南通·期末 查看更多[2]
更新时间:2024-01-26 21:34:33
|
相似题推荐
解答题-证明题
|
适中
(0.65)
名校
【推荐1】在四棱锥
中,
,
,
,
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/2020/11/13/2591930779721728/2591972310302720/STEM/aeeb10b7-4416-4a3b-8453-7db52ad6ed0b.png)
(1)求证:
面
;
(2)已知点F为
中点,点P在底面
上的射影为点Q,直线
与平面
所成角的余弦值为
,当三棱锥
的体积最大时,求异面直线
与
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f571396be1aa4a8914a66f7d7abd6381.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4bd6a2b112facda441f4e34bf5c145fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e918b70b02a73685e3c536c7f380e2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc11331a7b2d2619b40ee6d34c3bd620.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f8eeeea1c9652cacce976f8129cf520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/748976b9d6406bf5f2598845ec69c2de.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f70668849c6576860a4ac83921ce165f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d18919f4c3eb7b358bce11ebaef4150b.png)
![](https://img.xkw.com/dksih/QBM/2020/11/13/2591930779721728/2591972310302720/STEM/aeeb10b7-4416-4a3b-8453-7db52ad6ed0b.png)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9b489ed5afdb721bf9973c9089c504eb.png)
(2)已知点F为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20a541b81584a032f571159ea152c85a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/827ccf0c04aa941ba20d5f4c6068b46b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f9148c85a7cf8cca5788f98c2e8a47f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8db072e2b6104671b82f948012fb45.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
解题方法
【推荐2】从①
,②G是
的中点,③G是
的内心.三个条件中任选一个条件,补充在下面问题中,并完成解答.在四棱锥
中,底面ABCD是矩形,
底面
,且
,
,
,
,
分别为
,
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/857bc424-f0c7-4582-986c-e9d92e658a8f.png?resizew=175)
(1)判断EF与平面
的位置关系,并证明你的结论;
(2)若G是侧面
上的一点,且________,求三棱锥
的体积.
注:如果选择多个条件分别解答,则按第一个解答计分.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ecd44a18989da3cb1ed7eebc42936a2c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c025ee3317be1099b7bf03a11e37ed4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/1bec03e804f0cea1db5cde2aa185056a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a92bbf785cfeb738f91e11dd122d9e87.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.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/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/857bc424-f0c7-4582-986c-e9d92e658a8f.png?resizew=175)
(1)判断EF与平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/852aabd89edffc1b94344ff3f1f31ccd.png)
(2)若G是侧面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa5906367509465243251427f1e5e7a0.png)
注:如果选择多个条件分别解答,则按第一个解答计分.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
名校
【推荐1】刍(chú)甍(méng)是几何体中的一种特殊的五面体.中国古代数学名著《九章算术》中记载:“刍甍者,下有袤有广,而上有袤无广.刍,草也.甍,屋盖也.求积术曰:倍下表,上袤从之,以广乘之,又以高乘之,六而一.”翻译为“底面有长有宽为矩形,顶部只有长没有宽为一条棱.刍甍字面意思为茅草屋顶
”现有一个刍甍如图所示,四边形
为长方形,
平面
,
和
是全等的等边三角形.
;
(2)若已知
,
①求二面角
的余弦值;
②求该五面体
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/daa5e9bd516f6282483b92cfe6074623.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06222ee533c2484ab25321a6abbf98cb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6830ebecddbd9759be626289c408e4f3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/70099a8a0e7cff25485a63e8811a6aab.png)
(2)若已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c589c8207e40ad3355bbb8167de3486.png)
①求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77a34e44c5d7e1d22521fb293994f5b0.png)
②求该五面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
解题方法
【推荐2】如图,圆锥的轴截面是边长为2的等边三角形.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963713819893760/2967935667527680/STEM/190db5ba-1b28-46bd-a439-0a74856db196.png?resizew=195)
(1)E、F是底面圆周上两点,M为线段EF中点,若∠EOF=90°,求PM与底面所成角的大小;
(2)判断经过圆锥任意两条母线的平面与圆锥底面所成的二面角是否会小于60°?说明理由.
![](https://img.xkw.com/dksih/QBM/2022/4/22/2963713819893760/2967935667527680/STEM/190db5ba-1b28-46bd-a439-0a74856db196.png?resizew=195)
(1)E、F是底面圆周上两点,M为线段EF中点,若∠EOF=90°,求PM与底面所成角的大小;
(2)判断经过圆锥任意两条母线的平面与圆锥底面所成的二面角是否会小于60°?说明理由.
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图,在四棱锥
中,
底面
,
分别为
的中点.
(1)证明:![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
平面
;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.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/657232c1d8b201d49c98659d218a9e72.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7631a5587cdcb6c1f2350955f8709d68.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/2/2258118c-3370-4abe-9c68-6d18c179941d.png?resizew=177)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a9bfa68259d7a331be323b2038d628a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/29f9bc6bf8ca426813d10b6db2e32d26.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】在三棱锥
中,平面
平面ABC,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/54dae05e-0b96-4dbd-b416-e0ce163296ef.png?resizew=217)
(Ⅰ)证明:
平面ABC;
(Ⅱ)已知Q,M,N分别为线段PA、PB、BC的中点,求直线MN与平面QAC所成角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83d6b08ffdd8b042a78cf6b569210f75.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/54dae05e-0b96-4dbd-b416-e0ce163296ef.png?resizew=217)
(Ⅰ)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b5f1897a7e856b42f8cee0f286ad913d.png)
(Ⅱ)已知Q,M,N分别为线段PA、PB、BC的中点,求直线MN与平面QAC所成角的正弦值.
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
名校
【推荐2】如图,三棱柱
中,
,
,
.
;
(2)若平面
⊥平面
,
,动点P在线段
上,且
的正弦值为
,求
与
成角余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d89ba4036a5d18ec4abed44d7fd8e89.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1baa3d0db9ad31d33c2883a6efed1dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b29e8a1eefb6776168969a1155c9e9c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba985fb50a9078a839b66bf1d1eadea9.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4908fad3dc6fe1b0675c870328f043ef.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f776a27765b22790d41eb7b1c79b296.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9868f77d5ab5073b6145f1c6d272122e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
解答题-问答题
|
适中
(0.65)
【推荐1】如图1,在等腰
中,
,D,E分别为
,
的中点,F为
的中点,G在线段
上,且
.
,将
沿
折起,使点A到
的位置(如图2所示),且
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/3c63c3b6-4b9b-465d-8db8-ed620d1c11e4.png?resizew=336)
(1)证明:
平面
;
(2)求平面
平面
所成锐二面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2f8f88798ec42a58dccd212586382b23.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e3262fc038bbec5e7c8cc47df08bef7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d9b18321bae0d4c7e0ac9c60f14ae4e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e65a3e478bb87d094e3a0af30dd10ae8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a18722354086c42e62334983fc50eb6a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3f7be7700b3b4177237b841636ccc5d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/13/3c63c3b6-4b9b-465d-8db8-ed620d1c11e4.png?resizew=336)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c372d059202ec388960b125d4a87dc84.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f88e4ba83d407225853224582e6bf94.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f88e4ba83d407225853224582e6bf94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/923189afc198d153c79059a827f63c87.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐2】在四棱锥
中,底面
是正方形,若
.
平面
;
(2)求二面角
的平面角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/55c6caa0455442437177ab9b995df37b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac6ff36ca0c0b166dc98b9c4ce7a59e7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb11df029afb11e4233989b1338cb3a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5db7c9997f1d885cfece6ee4f44ff00.png)
您最近一年使用:0次
解答题-证明题
|
适中
(0.65)
【推荐3】如图,在几何体
中,四边形
为平行四边形,平面
∥平面
,
、
、
都垂直于平面
,E、F分别为
、
的中点.已知
,
.
![](https://img.xkw.com/dksih/QBM/2022/4/14/2957769509937152/2960025272188928/STEM/30dc6599b7724847b0ebfa11d626cc9a.png?resizew=165)
(1)求证:
;
(2)求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67e05241efa370017b863e6e0fe72bbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6d00ebd235b307e18fd45364091ec6b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/22adbc0da438220f9cace11b629d799b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f945a69cf7e8213e50622125cde652f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aa8b08a5973c5fb5d9084a2f84df49ec.png)
![](https://img.xkw.com/dksih/QBM/2022/4/14/2957769509937152/2960025272188928/STEM/30dc6599b7724847b0ebfa11d626cc9a.png?resizew=165)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/124b94d4c9318df3e765ef2d3f7d1c8b.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69130cf2e4541c2a849cdc5d2d9dfb92.png)
您最近一年使用:0次