如图,在直三棱柱ABC-A1B1C1中.∠ BAC=90°,AB=AC=AA1 =1.D是棱CC1上的一点,P是AD的延长线与A1C1的延长线的交点,且PB1∥平面BDA.
(I)求证:CD=C1D:
(II)求二面角A-A1D-B的平面角的余弦值;
(Ⅲ)求点C到平面B1DP的距离.
(I)求证:CD=C1D:
(II)求二面角A-A1D-B的平面角的余弦值;
(Ⅲ)求点C到平面B1DP的距离.
![](https://img.xkw.com/dksih/QBM/2011/6/15/1570238676590592/1570238681956352/STEM/eb749ad7d68147aba6b00c1d6ab87276.png?resizew=261)
2011·四川·高考真题 查看更多[5]
更新时间:2016-11-30 22:01:41
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【推荐1】如图所示,在三棱锥P-ABC中,AC=BC=2,∠ACB=90°,AP=BP=AB,PC⊥AC.
![](https://img.xkw.com/dksih/QBM/2012/1/14/1570690661867520/1570690667356160/STEM/1d3d879b99624094902d689325a13e4e.png?resizew=240)
(Ⅰ)求证:PC⊥AB;
(Ⅱ)求直线BC与平面APB所成角的正弦值;
(Ⅲ)求点C到平面APB的距离.
![](https://img.xkw.com/dksih/QBM/2012/1/14/1570690661867520/1570690667356160/STEM/1d3d879b99624094902d689325a13e4e.png?resizew=240)
(Ⅰ)求证:PC⊥AB;
(Ⅱ)求直线BC与平面APB所成角的正弦值;
(Ⅲ)求点C到平面APB的距离.
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【推荐2】如图,已知四棱锥
的底面是梯形,
且
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/3d846ab7-6cbd-4970-8412-43af4152105b.png?resizew=189)
(1)若
为
的中点,证明:
⊥平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff14a33c2ffdf20e42171df628622d9d.png)
(2)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b449686ee4778552f864bb2a1aa8ac51.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385df8c6bf6a33bc3247f12f296fb084.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/3/3d846ab7-6cbd-4970-8412-43af4152105b.png?resizew=189)
(1)若
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef49a3ca580a144cc65a609c167facc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff14a33c2ffdf20e42171df628622d9d.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e582d73b96ba649378379c3074d506d.png)
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【推荐1】如图,直三棱柱
中,
,
,
是棱
上的动点.
(1)证明:
;
(2)若平面
分该棱柱为体积相等的两个部分,试确定点
的位置,并求二面角
的大小.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ed8f7d3d7043d4b1eb98fc5c4e2fcd3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/512cc5f78111d4592f6d843db6915f4c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/896d66e2af642634094aec5187f29a21.png)
(2)若平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6bf9628142422a4884bd59538da6d312.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/98e0254c84e44728749b34c08c28ab1e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/4/a67addaa-0f90-4b73-ac71-a465065696be.png?resizew=146)
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【推荐2】如图,在几何体
中,底面
是边长为2的正方形,
平面
,
,且
.
![](https://img.xkw.com/dksih/QBM/2020/12/17/2616174184923136/2618454743359488/STEM/90cfa18668ea43a9b7a11d6c58538d1e.png?resizew=186)
(1)求证:平面
平面
;
(2)求证:
;
(3)求钝二面角
的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/07d2f152a8da561c9eeb6ba2ef091dc2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd0e59437b5fa6ce66fb2f405dea8f18.png)
![](https://img.xkw.com/dksih/QBM/2020/12/17/2616174184923136/2618454743359488/STEM/90cfa18668ea43a9b7a11d6c58538d1e.png?resizew=186)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e83e602c2b4540c6c7454f5f0948544.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b9a32bd7a1b78b5a0ec562c4025aea8c.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf23e73ae2a15c04bbed3981cb8e511.png)
(3)求钝二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0a3b7d47511f83a3d6fd52f854da04.png)
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【推荐3】如图,在四棱锥
中,平面
平面
,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/8aee5aab-2eb8-4b8c-8f86-4537ac185017.png?resizew=140)
(1)证明:
平面
;
(2)求二面角
的正切值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5164a3cc47e266446d49127e2ef10c37.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3d7090639341730951c1bc3c9b6164e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2fa7bbd7831e9ff4f8cffc8889d34f05.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e73ff18fab460a2bc8d21cc522527e67.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/292d0b9ce587bd5df884a988c22ccba2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd316249a2a4333a6e37ea6ba4c0e67b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/71807a35b3170fce28ee6edf4c00d083.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/12/8aee5aab-2eb8-4b8c-8f86-4537ac185017.png?resizew=140)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8d2d217e9bcd059908f117dfc4d4259.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b4eb7e9ad5486cf1c5e506b20c5469e8.png)
(2)求二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd29cc627d76412c236aac6b29fa0fdf.png)
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