如图,在边长为3的正方体
中,点P,Q,R分别在AB,
,
上,且AP=
=1,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3db1494a1d927f971490c18a54cbcce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/17e95837-2109-42e4-9ca2-227096bfdce4.png?resizew=197)
(1)求点D到平面PQR的距离
(2)判断点N是否在平面PQR内,并证明你的结论.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/56f7ba05c54b3de1f4378f7c8eb58328.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0e3334853138fb74687d66b1e45f2fd9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d105ed140e47249d237dbdfda67ef131.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f3db1494a1d927f971490c18a54cbcce.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/28/17e95837-2109-42e4-9ca2-227096bfdce4.png?resizew=197)
(1)求点D到平面PQR的距离
(2)判断点N是否在平面PQR内,并证明你的结论.
更新时间:2022-01-09 17:31:46
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【推荐1】如图,在正四棱锥
中,E,F分别为
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.
(1)证明:B,E,G,F四点共面.
(2)记四棱锥
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(1)证明:B,E,G,F四点共面.
(2)记四棱锥
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【推荐2】如图2,P-ABCD为四棱锥.
![](https://img.xkw.com/dksih/QBM/2023/1/5/3146245825396736/3147188518641664/STEM/131a78e7c2bb431ebf0e22f7250b22d4.png?resizew=227)
(1)若
,求证:
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(2)若P-ABCD为正四棱锥,且
,求底面中心O到面PCD的距离.(要求用向量知识求解)
![](https://img.xkw.com/dksih/QBM/2023/1/5/3146245825396736/3147188518641664/STEM/131a78e7c2bb431ebf0e22f7250b22d4.png?resizew=227)
(1)若
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c62ee86d61df389e770300c81611e630.png)
(2)若P-ABCD为正四棱锥,且
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f235e99b0b55ac252c4b18cc315dc114.png)
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解题方法
【推荐1】如图,在四棱锥
中,底面
是边长为2的正方形,
底面
,
,
为
的中点,
为
的中点,解答以下问题:
平面
;
(2)求直线
与平面
所成角的余弦值.
(3)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/06a5faf3cbb633fc4294c8ce703c64c3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4317430d5a2b61d9a2a88b73e7d7ad39.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9774f83067ed956a551bc41adcce0469.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef4113c492885ba7c47fe42ac792578f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201d3796ed9a29338aac25245a7c8e2.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/54a5d7d3b6b63fe5c24c3907b7a8eaa3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3201d3796ed9a29338aac25245a7c8e2.png)
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【推荐2】如图,已知正方体
的棱长为
,
是
的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/25bf1257-2b8b-4361-ad25-af28dd025328.png?resizew=159)
(1)求证:
平面
;
(2)求点
到平面
的距离;
(3)求平面
和底面
夹角的正弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/9/25bf1257-2b8b-4361-ad25-af28dd025328.png?resizew=159)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a5928c98b341b16d4b5a5b931d2929d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fd7cc5d9199856cb62ac8898664c931.png)
(2)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcb3226e013650b7d8827c31dd41d0.png)
(3)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69bcb3226e013650b7d8827c31dd41d0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/632f2bf1cd0435041fa04b01901d1c8c.png)
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【推荐3】如图,已知
和
都是直角梯形,
,
,
,
,
,
,二面角
的平面角为60°.设
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分别为
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的中点.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/7afc3dd1-c232-478f-ba03-c658310b4280.png?resizew=209)
(1)求证:
平面
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(2)求直线
与平面
所成的角.
(3)求点
到平面
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b32c05247f6998d7a70d31d13be4148c.png)
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![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/2/7afc3dd1-c232-478f-ba03-c658310b4280.png?resizew=209)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e713c9d539ed8c896a77b9433748bea.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(2)求直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/18d5a164bf56f8fb92527ad78bc10ccf.png)
(3)求点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/369eb8ad56da7dc1cdb7c43762be4bee.png)
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