名校
解题方法
1 . 如图,已知二面角
的平面角为
,棱
上有不同的两点
,
.若
,则下列结论正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/754bbd99327195520a4ca3ce3b9a0577.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac1a63ab608517bb10aa036783dfb51f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fa39ea3905adefa094140b721ab5a47.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/573e274644284456ddc516f1c40f09d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e9b9d23b4f8dd581461004689d0b863.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/18/9144243e-50db-4a4b-bf9f-3c9e7a5d2c8e.png?resizew=170)
A.点![]() ![]() | B.直线![]() ![]() ![]() |
C.四面体![]() ![]() | D.直线![]() ![]() ![]() |
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2 . 已知向量
,则向量
在向量
上的投影向量
的坐标为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/671ffb780b3c36cd2435c4af6417b349.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a2f4b1178f68bd147d1a2a6acd04435.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94075193c11fe43f2396cff5a485054.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d366d8fbb7258ee051f49977441e14a2.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
解题方法
3 . 如图,已知在平行六面体
中,所有的棱长均为2,侧面
底面
为
的中点,
.
底面
;
(2)求平面
与平面
所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/384ffa4e596b6c7b8e270217a47f7227.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d41a81d84b5bf7bf622431a7a824b53f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f66fb71b75b63594ebeeeebd1963eed5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae74c552e84ab627aaf98b5e792c6e94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d5755c99eb02f90e41c482c52adeabf0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a8035fc825a001d7d9a3dacd8271662.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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解题方法
4 . 在三棱柱
中,
,若
,则二面角
的余弦值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3332016d7fccd47aad039768ecc34292.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f95a09aa385a3591facd2132dde809.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18b42d91ade9933f47404dc8a74e55fa.png)
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名校
解题方法
5 . 在四面体
中,
,记四面体
的内切球半径为
.分别过点
向其对面作垂线,垂足分别为
.
(1)是否存在四个面都是直角三角形的四面体
?(不用说明理由)
(2)若垂足
恰为正三角形
的中心,证明:
;
(3)已知
,证明:
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f92b09f88aee4ed088bf9b86fd5bc53b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11bc05f41215f9894e11d1df0465751a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c82a10b4f0c9323d726804c89dd9548.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f2dbca1604730621745c4bb6d4ccb051.png)
(1)是否存在四个面都是直角三角形的四面体
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)若垂足
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/86163e76653de1f383788b741fb64a8b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/661ff55b5ebbadfb600989af3cfce2fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c221ff3fe097b42c9ceeb0264f68e73f.png)
(3)已知
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b370607990efe29a620c617f90dd6ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c7c775033404a8047fc0bd60356ca7e.png)
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解题方法
6 . 如图,四边形
为梯形,
.等腰直角三角形
中,
为腰
的中点,平面
平面
.
(1)求异面直线
与
所成角的大小;
(2)求证:
平面
;
(3)求
与平面
所成角的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebd607593ed561ce7e94991e01b9a32.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddb7c2ca1b6bee86cb24fed02e40da2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4165d6c2bdfdf3b4d7ea8afb3b6dad7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0bb5012f6c70a1e98d682b6d021fadd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/6/18/4249ee04-1c4e-4cb0-9547-1facd12a8a5d.png?resizew=181)
(1)求异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d50703c46b6153945d718b198f03b4b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0edb1508fc95765f3bb316bcb5252d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bc46688d8723cf2003fc25890265200.png)
(3)求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/aaf3369e0ea90e8d5cf4b6b3c45c0fd8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2730b513bd3359c3dfe6567e04f5ef9.png)
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7 . 如图,四棱锥
的底面
为矩形,且
平面
,若
,则下列结论错误 的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e4117625867a74cd022584500c76deca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3fb7c585995d694d03475797830ca98f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/795eb94a21fc9699d55bb819ec6bd3b8.png)
A.直线![]() ![]() ![]() | B.平面![]() ![]() |
C.![]() | D.二面角![]() ![]() |
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8 . 如图,在梯形
中,
,
,
,
是
的中点,将
沿
折起,使
位于
处,且
.
平面
;
(2)求直线
与平面
所成的角的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae1e04eeb4de72e5750dae77bcb6f88a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1134c8e3440abb6cd385af2c169037fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d78aafccd397e9c88a567abf4993d40f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f96bcaab1157f577919c7abc73a66ebd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/828628c0876b45381c9a0edeb0fec236.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da0e4a5ebc5b252fb464fc3be7a86478.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bbc6f007dbf1c1a36eb031e520608403.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/607543bb9f55b8a141ed2d6cf0e1a20b.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
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名校
解题方法
9 . 如图,在正三棱柱
中,
是
的中点,
.
∥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/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92105835f8075cb75dff244e908370b5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5888bec948373f3854258ad80171073d.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7caf5cf7af17598e879101cf25f7de9.png)
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10 . 棱长为
的正四面体的外接球的表面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
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