如图,在三棱锥
中,
是等边三角形,
,点
在BC上,
平面PAD.
平面PBC;
(2)求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/938573218a7f963819446f473523d674.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fbc2062ac3276ddd25fa9603f2eac26f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/12a4bddf1ea3c5d37f2233a4821909e9.png)
23-24高三下·江西·阶段练习 查看更多[2]
更新时间:2024-05-06 07:57:40
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解答题-证明题
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【推荐1】如图,多面体ABCDE中,四边形ABED是直角梯形,∠BAD=90°,DE∥AB,△ACD是的正三角形,CD=AB=
DE=1,BC=![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/d89e000f-a5b7-41ba-9631-e0638fd483ee.png?resizew=170)
(1)求证:△CDE是直角三角形
(2) F是CE的中点,证明:BF⊥平面CDE
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f89eef3148f2d4d09379767b4af69132.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/9/d89e000f-a5b7-41ba-9631-e0638fd483ee.png?resizew=170)
(1)求证:△CDE是直角三角形
(2) F是CE的中点,证明:BF⊥平面CDE
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【推荐2】如图,在四棱锥
中,
底面
,底面
为菱形,
,
,
为
的中点.
平面
;
(2)求平面
与平面
所成二面角的正弦值.
![](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/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e075468e7fb0bf30229aec01a7205977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc61de08bda0c44e06ad89d306c0bb3f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97f30533da2e1d2a958dc906c37eba9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e6c2dad46a9052a4185a4f7b4ae8a2e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e7b7c83470489253394bd288d7c920df.png)
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【推荐1】如图,在四棱柱
中,底面
和侧面
均是边长为2的正方形.
.
(2)若
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d56889f2417c8449b7ed31a03550d24.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fcb99b46d35b58383fb46737b99e8c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ee7e8d13fcdce579695d45a366eb7a3.png)
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【推荐2】如图,已知点P在圆柱
的底面圆O上,
为圆O的直径,圆柱
的侧面积为
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/2b5ced2a-7fb3-4714-9eea-610d5f65001f.png?resizew=170)
(1)求三棱锥
的表面积;
(2)求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/192f4f9446c954a291f779d963f90257.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6ee6945a1b2d61177fc7850f08fedd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dfffb77e9656a22d5951d9f1c6a7c9d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/14/2b5ced2a-7fb3-4714-9eea-610d5f65001f.png?resizew=170)
(1)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5495a154d006c33979813b86924dc0f9.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5cd965ec91dfccc0b19acf22d4945c19.png)
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【推荐3】《九章算术》中,将底面为长方形且有一条侧棱与底面垂直的四棱锥称之为阳马,将四个面都为直角三角形的四面体称之为鳖臑.如图,在阳马中,侧棱
底面
,且
,过棱
的中点
,作
交
于点
,连接
.
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c45fbffb9e2c7fa7c5006cde8da0cabe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84a057d1628869f03da479b8f5ef62f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】如图,三棱柱
中,侧棱
底面
,
,
,
是
的中点,
是
的中点,
是
与
的交点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/5994a9c1-75c8-4451-bd00-5dc434074b3a.png?resizew=154)
(1)求证:平面
平面
;
(2)求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ed10df4140819d5451773a45de66201b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/57402d76e0933d8f38893faaddcc75d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7f6f93171329d508d491143b9d71f7b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/5994a9c1-75c8-4451-bd00-5dc434074b3a.png?resizew=154)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80484e94de33c32474ef90f77127ae51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11aac26e79b03fa65ef317a8561ec518.png)
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【推荐2】如图,在四棱柱
中,底面
和侧面
都是矩形,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/8ec41250-20d9-4d5b-b38c-7290c856322a.png?resizew=181)
(1)求证:
;
(2)若平面
与平面
所成的角为
,求三棱锥
的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0aef94a77e3b06433f63a323bd887fb5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e0a3aca8f55798a8e143179f2806dd8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/23/8ec41250-20d9-4d5b-b38c-7290c856322a.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/354e321ac9ab002db04261253b19ba9d.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc78a86b12ba0b4553135a3a635fc418.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d5bca00fa20e6e80480b9d06d2e52ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c6c4a70ff0df50ccdc6da2a4e935032c.png)
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