1 . 如图,三棱台
中,
是边长为2的等边三角形,四边形
是等腰梯形,且
,
为
的中点.
;
(2)若过
三点的平面截三棱台
所得的截面面积为
.当二面角![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf41a3fcbd83bb806c9c4cbec8e36d2.png)
为锐二面角时,求二面角
的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2d9a8181f7a7fe7f3fac872ce9534f15.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/51f856c50b63de74c8e85c608e9dcc0c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cfc1f76257275ab4b04f9bc913535670.png)
(2)若过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eb7ca1a5419f8a52b3141b0bc7b47dad.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d3eb19246fe0299ae396fc9a7e1ee6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cbf41a3fcbd83bb806c9c4cbec8e36d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e07eba786740939ce0ec951572b02f0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/047b9fd4020265766074c80a7f8ad3a0.png)
您最近一年使用:0次
2 . 如图,正方体
中,
,点
分别是棱
的中点.
的结构特征,判断该几何体是哪种多面体,并结合该类多面体的定义给出证明;
(2)求多面体
的表面积和体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/334bd1a151c0a42ca813cb6b839ce45c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1b448a14b6c26040126e4d67fcb9c5.png)
(2)求多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe1b448a14b6c26040126e4d67fcb9c5.png)
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解题方法
3 . 如图,多面体
中,四边形
与四边形
均为直角梯形.已知点
四点共面,且
.
(i)平面
平面
;
(ii)多面体
是三棱台;
(2)若
,求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1d70676406f26d339465fe3473c0c05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61510c34c5795d7261569b4d09098271.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2dddb7e8d3e52c81162d138810af5bb4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5c1481aac509fb21da13c880bd2b0b52.png)
(i)平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/617edf7f259f5955db7cad814af85281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
(ii)多面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3b897aa321604496f26b01a6a302f56.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b312dab930cbbb9a4bb1a99f044dab73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
您最近一年使用:0次
名校
解题方法
4 . 已知直角梯形形状如下,其中
,
,
,
.
(1)在线段CD上找出点F,将四边形
沿
翻折,形成几何体
.若无论二面角
多大,都能够使得几何体
为棱台,请指出点F的具体位置(无需给出证明过程).
(2)在(1)的条件下,若二面角
为直二面角,求棱台
的体积,并求出此时二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7972619832ab08705c12f2486aa13602.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/305a88d4e0249bd16d48eda01331d2d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/09d27bd71d79cb19eb554175e4ef0867.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/6/5/89d10d27-7a5c-4999-b048-68bb095d4ed3.png?resizew=375)
(1)在线段CD上找出点F,将四边形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08c14e87a2bcf7090eab2fea73667d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc6a1a01fdb186620b7939c789fb8bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab64d1bfb556d9c529f867b9c83ad67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc6a1a01fdb186620b7939c789fb8bf3.png)
(2)在(1)的条件下,若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8ab64d1bfb556d9c529f867b9c83ad67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc6a1a01fdb186620b7939c789fb8bf3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd22fa132fa5c914b527c2781a516049.png)
您最近一年使用:0次
2023-06-03更新
|
716次组卷
|
3卷引用:辽宁省实验中学2023届高三第五次模拟数学试题
名校
5 . 如图,一个高为8的三棱柱形容器中盛有水,若侧面
水平放置时,水面恰好过
,
,
的中点E,F,G,H.
、直线FG与平面
的位置关系(不要求证明);
(2)有人说有水的部分呈棱台形,你认为这种说法是否正确?并说明理由.
(3)已知某三棱锥的底面与该三棱柱底面
全等,若将这些水全部倒入此三棱锥形的容器中,则水恰好装满此三棱锥,求此三棱锥的高.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0ef7c3e2a0f5b06e4e85255bbc12c3c2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8b8a295e9474afc5e3628832bd3724f1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)有人说有水的部分呈棱台形,你认为这种说法是否正确?并说明理由.
(3)已知某三棱锥的底面与该三棱柱底面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
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解题方法
6 . 在三棱台
中,
平面ABC,
,
,
,M为AC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/76e196e5-dae0-4806-abbd-d5abf35695ea.png?resizew=181)
(1)证明:
平面
;
(2)若
,求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1ecf072589c0f901d92f6bda111d841.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/080db3af81b29ed10144a1c2e2a4fb8a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bd46192ef38736d992bf2b330b07bfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ea937da23eb3b8ae2affe2fa41ca085b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/5/7/76e196e5-dae0-4806-abbd-d5abf35695ea.png?resizew=181)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d1d2e0f281222a5f289ea4008370aed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9078475c350c04bd97666d808dd55a.png)
(2)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54638dd4ebf19815a1333d84e42f927.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97c01fdc7bc471af0b264a04aef0823e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/de9078475c350c04bd97666d808dd55a.png)
您最近一年使用:0次
名校
7 . 如图,在四棱台
中,
,
,四边形ABCD为平行四边形,点E为棱BC的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/18/b55bea8d-bb31-4071-9258-67d80c8068c8.png?resizew=217)
(1)求证:
平面
;
(2)若四边形ABCD为正方形,
平面ABCD,
,求二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fcd0ced286a0fbc7e4862f8147264277.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f54638dd4ebf19815a1333d84e42f927.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/18/b55bea8d-bb31-4071-9258-67d80c8068c8.png?resizew=217)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e44edb46eb17d224e0d9a2667c2e5df9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
(2)若四边形ABCD为正方形,
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/35909b72f6e48a33ae9abb1d63ff91aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdf257663b954b4a9e4fe1edef662c9e.png)
您最近一年使用:0次
2022-06-17更新
|
693次组卷
|
3卷引用:广东省梅州市大埔县虎山中学2022届高三下学期5月底热身考试数学试题
解题方法
8 . 如图,在三棱台
中,
,H为BC的中点,点G在线段AC上,
平面FGH.
平面ABC,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/12abfaa3-1c84-43e4-8516-e26c79e362ad.png?resizew=223)
(1)求三棱台
的体积;
(2)求证:点G为AC的中点.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8783bc74553bf44b61d999a0e4144bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ef213619b414839178423bd71b4f81e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e3c0430146b7b8d40ebb721a4d0de19.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7b5a90e556da12d63b7f481bd8e874c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4a7ee687c3ad4a6e97315491c619fc94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/7/24/12abfaa3-1c84-43e4-8516-e26c79e362ad.png?resizew=223)
(1)求三棱台
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a8783bc74553bf44b61d999a0e4144bb.png)
(2)求证:点G为AC的中点.
您最近一年使用:0次
名校
解题方法
9 . 已知直角梯形
,其中
,
,
,且
、
分别是
、
的中点,将梯形
沿
翻折,并连接
、
形成如下图的几何体
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/32310087-7727-4c91-a4b8-0f0ec10d091a.png?resizew=363)
(1)判断几何体
是哪种简单几何体,并证明;
(2)若二面角
的大小为
,求直线
与平面
的夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ee8ef58be8708144272538ee427fb92c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cdb2dd10731b99c0f4f89ee957f8a239.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5919f58fcb3b846c529b09225d0cb099.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](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/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.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/3e949b2a04e2d6231f7f24ee5e268b9b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/3/32310087-7727-4c91-a4b8-0f0ec10d091a.png?resizew=363)
(1)判断几何体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e949b2a04e2d6231f7f24ee5e268b9b.png)
(2)若二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e0e5c6e11ce0976b4e599e741ddfc68.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c02b54dc6b3e1bb6544f47d4c8743fcf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf126cfed85fa9b7720ec6f7b0008dc.png)
您最近一年使用:0次