1 . 如图,正四面体
的棱长为1,平面
过棱
,且
,则正四面体上的所有点在平面
内的射影构成的图形面积是____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/111a3a687194e2fea3627b5a00cf474e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/2022/11/9/3105867016994816/3106035374743552/STEM/b9fd2cbb94b447918c8adc74cb371c16.png?resizew=344)
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2 . 在空间直角坐标系
中,已知
,
,
,
,若
,
,
分别表示三棱锥
在
,
,
坐标平面上的正投影图形的面积,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a834024400d0730af3e640ca4d5f54b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b889a93a6b77ffd108de41bc470d08f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97ecf78090de9b894a74602892e5412b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd471a3e64b76d4c5944458aeb707297.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/77e8611b09c15dfea54a36bf8a15cd29.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1e0bd63f55069a3bc870915010b39225.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6899bf9cadae2ccdb14cbc87d4f280ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ddd48d1ef9e8cd3b7aea60fd95b70fb6.png)
A.![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
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2021-09-08更新
|
205次组卷
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3卷引用:青海省西宁市城西区青海湟川中学2020-2021学年高二上学期期中数学试题
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3 . 在棱长为1的正方体
中,点M是线段
上的动点,平面
与正方体的截面记为S,则下列结论正确的是__________ .
①存在点M,使得截面S为五边形;
②存在点M,使得截面S面积的最大值为
;
③当
时,截面S为正三角形;
④
在平面
与平面
上的正投影的面积始终相等.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9add124915b6e2fae559557cdb3561a8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2ca774dca167b19194c05488de64ed68.png)
①存在点M,使得截面S为五边形;
②存在点M,使得截面S面积的最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf298f00799cbf34b4db26f5f63af92f.png)
③当
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24ff6828760eb2700cf9e5f92eaef7ab.png)
④
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ce447afe4b0bb57a844b2c103b55fc71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/129141575a08c229a368b3cff7f7a45f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e9edc50f7febbc2d5d8dcdc23a3630a7.png)
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解题方法
4 . 如图所示,在正方体ABCDA1B1C1D1中,M,N分别是棱AB,CC1的中点,△MB1P的顶点P在棱CC1与棱C1D1上运动,则( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/d413db6a-eab0-48c2-a14a-5ffccff201e9.png?resizew=168)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/3/d413db6a-eab0-48c2-a14a-5ffccff201e9.png?resizew=168)
A.平面MB1P⊥ND1 |
B.平面MB1P⊥平面ND1A1 |
C.△MB1P在底面ABCD上的射影图形的面积为定值 |
D.△MB1P在侧面DD1C1C上的射影图形是三角形 |
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5 . 已知正方体的棱长为2,平面
过正方体的一个顶点,且与正方体每条棱所在直线所成的角相等,则该正方体在平面
内的正投影面积是__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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2020-06-25更新
|
238次组卷
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3卷引用:内蒙古呼和浩特市2020届高三第二次质量普查调研考试(二模)数学(理)试题
6 . 在棱长为1的正方体ABCD﹣A1B1C1D1中,点M,N分别是棱B1C1,C1D1的中点,过A,M,N三点作正方体的截面,将截面多边形向平面ADD1A1作投影,则投影图形的面积为_____ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/1/83746384-fcb6-4978-85bd-fb45e81bc52d.png?resizew=349)
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2020-06-08更新
|
323次组卷
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2卷引用:江西省九江市2020届高三第三次模拟考试理科数学试题
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7 . 如图,直线
平面
,垂足为
,正四面体
的棱长为2,
,
分别是直线
和平面
上的动点,且
,则下列判断:①点
到棱
中点
的距离的最大值为
;②正四面体
在平面
上的射影面积的最大值为
.其中正确的说法是.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/ad8a8194-89ed-4d80-800d-bd6ac7a87a8f.png?resizew=232)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9df740160690029ac1e730c85f20347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fa145a3e4f18f784ddf4869e0bf904c5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1f190b17530d81d927c358ac84757a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7ffe8515ff6183c1c7775dc6f94bdb8.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/22/ad8a8194-89ed-4d80-800d-bd6ac7a87a8f.png?resizew=232)
A.①②都正确 | B.①②都错误 | C.①正确,②错误 | D.①错误,②正确 |
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2020-05-21更新
|
486次组卷
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2卷引用:2020届上海市黄浦区高三二模(阶段性调研)数学试题
8 . 如图直线
平面
,垂足为
,正四面体
的棱长为2,
在平面
内,
是直线
上的动点,则当
到
的距离为最大时,正四面体在平面
上的射影面积为
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/a6cadbad-99e9-49c2-a6db-7905ff607315.png?resizew=173)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a9df740160690029ac1e730c85f20347.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f85fca60a11e1af2bf50138d0e3fe62.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/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/23/a6cadbad-99e9-49c2-a6db-7905ff607315.png?resizew=173)
A.![]() | B.![]() | C.![]() | D.4 |
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9 . 如图,四面体ABCD各棱长均相等,E,F分别是AC,AD的中点,则
在平面ABD上的射影是.
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/b5bf4e9f-82bc-46d4-bc7d-b6756b73b849.png?resizew=140)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/1/7/b5bf4e9f-82bc-46d4-bc7d-b6756b73b849.png?resizew=140)
A.![]() | B.![]() | C.![]() | D.![]() |
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10 . 如图所示,在正方体ABCD﹣A1B1C1D1中,M为DD1的中点,则图中阴影部分BC1M在平面BCC1B1上的正投影是( )
![](https://img.xkw.com/dksih/QBM/2019/1/14/2118614208421888/2118759998095360/STEM/188471ad-df3b-4bee-a10f-5a219b08405f.png?resizew=210)
![](https://img.xkw.com/dksih/QBM/2019/1/14/2118614208421888/2118759998095360/STEM/188471ad-df3b-4bee-a10f-5a219b08405f.png?resizew=210)
A.![]() | B.![]() | C.![]() | D.![]() |
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2019-01-14更新
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420次组卷
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8卷引用:【市级联考】广东省珠海市2019届高三9月摸底考试数学(文)试题
【市级联考】广东省珠海市2019届高三9月摸底考试数学(文)试题【全国百强校】黑龙江省哈尔滨六中2018-2019学年高二(上)期中考试数学(文)试题【全国百强校】江西省南昌市第十中学2019届高三上学期期中考试数学(理)试题【市级联考】河北省张家口市2019届高三上学期期中考试数学文试题(已下线)专题8.1 空间几何体的结构、三视图和直观图(练)-浙江版《2020年高考一轮复习讲练测》(已下线)专题8.1 空间几何体及其三视图和直观图(精讲)-2021年新高考数学一轮复习学与练(已下线)专题8.1 空间几何体及其三视图和直观图(精练)-2021年新高考数学一轮复习学与练(已下线)专题8.1 空间几何体及其三视图和直观图(练)-2021年新高考数学一轮复习讲练测