1 . 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
|
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
名校
2 . 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
3 . 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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4 . 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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5 . 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
6 . 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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7 . 如图,在正方体
中,
分别是
,
的中点,则四面体
在平面
上的正投影是
![](https://img.xkw.com/dksih/QBM/2018/7/3/1980696592719872/1982214190292992/STEM/c035d867bf6a41db942b8316142c9f64.png?resizew=117)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42c2d86d8daea5e652d99fe1c6bc3f9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6c95c0160e73beb94a4a1cbc0168e9a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f86dd74047dacc6c23e24bff4c40d947.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/611f100dcfa7803db6eb233e2e7f2dab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c52091eb745de866044477641a7c55f.png)
![](https://img.xkw.com/dksih/QBM/2018/7/3/1980696592719872/1982214190292992/STEM/c035d867bf6a41db942b8316142c9f64.png?resizew=117)
A.![]() | B.![]() | C.![]() | D.![]() |
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8 . 如图所示,在正方体ABCD-A1B1C1D1中,四面体A-B1CD1在面AA1D1D上的正投影图形为
![](https://img.xkw.com/dksih/QBM/2018/2/26/1890692452900864/1894008651587584/STEM/a0347d7a-4584-4c9c-8c2c-054417274a74.png?resizew=236)
![](https://img.xkw.com/dksih/QBM/2018/2/26/1890692452900864/1894008651587584/STEM/a0347d7a-4584-4c9c-8c2c-054417274a74.png?resizew=236)
A.![]() | B.![]() | C.![]() | D.![]() |
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名校
9 . 下列命题中错误的是
A.如果平面![]() ![]() ![]() ![]() |
B.如果平面![]() ![]() ![]() ![]() ![]() ![]() ![]() |
C.不存在四个角都是直角的空间四边形 |
D.空间图形经过中心投影后,直线还是直线,但平行直线可能变成相交的直线 |
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10 . 在正四棱锥
中(底面是正方形,侧棱均相等),
,且该四棱锥可绕着
作任意旋转,旋转过程中
平面
.则正四棱锥
在平面
内的正投影的面积的取值范围是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcf34539673d516eb9b259951a81ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04838415251e40ab0de3cb003642346d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6785c7c85a503531649f9c9b4cbfcf04.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebfcf34539673d516eb9b259951a81ed.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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