名校
1 . 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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2 . 平面外的一个直角在平面内的射影的图形是( ).
A.直角 | B.直角或钝角 |
C.直角、锐角或钝角 | D.以上都不准确 |
您最近一年使用:0次
3 . 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
|
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
名校
4 . 下图是棱长为2的正方体
木块的直观图,其中
分别是
,
,
的中点,平面
过点
且平行于平面
,则该木块在平面
内的正投影面积是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/ebdcde97-424a-4255-9dec-a0bbe8af5f89.png?resizew=221)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/76e955a4c2ae8528a6103a58e5c6e050.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fbafedc202bd0d86c4dfdece9f8f4fe.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1cbd36496e3751b0d35b6a9be53bf058.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/2/ebdcde97-424a-4255-9dec-a0bbe8af5f89.png?resizew=221)
A.![]() | B.![]() | C.![]() | D.![]() |
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2020-06-09更新
|
1095次组卷
|
7卷引用:2020届河南省六市(南阳市、驻马店市、信阳市、漯河市、周口市、三门峡市)高三第二次联合调研检测数学(理科)试题
2020届河南省六市(南阳市、驻马店市、信阳市、漯河市、周口市、三门峡市)高三第二次联合调研检测数学(理科)试题河南省六市(南阳市、驻马店市、信阳市、漯河市、周口市、三门峡市)2020届高三第二次模拟考试数学(理)试题江西省南昌二中2020届高三(6月份)高考数学(理科)校测试题(一)(已下线)对点练42 空间几何体的结构特征-2020-2021年新高考高中数学一轮复习对点练(已下线)专题06+直线、平面垂直的判定及其性质(基础练)-2020-2021学年高一数学十分钟同步课堂练(人教版必修2)(已下线)热点10 三视图还原问题-2022年高考数学核心热点突破(全国通用版)【学科网名师堂】(已下线)卷14-【赢在高考·黄金20卷】备战2021高考数学全真模拟卷(北京专用)
5 . 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)
您最近一年使用:0次
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
6 . 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 |
您最近一年使用:0次
2020-05-21更新
|
486次组卷
|
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
7 . 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 |
您最近一年使用:0次
名校
8 . 如图所示,
是正方体
对角线
与
的交点,
为棱
的中点,则空间四边形
在正方体各面上的正投影不可能是
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/7fb2f461-e075-442f-a369-a063d70639b6.png?resizew=148)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385444d07829ee543d288094b0425011.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/29/7fb2f461-e075-442f-a369-a063d70639b6.png?resizew=148)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
9 . 如图所示,
是正方体
对角线
与
的交点,
为棱
的中点,则几何体
在正方体各面上的正投影不可能是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/1d25cc95-d0a3-4d9c-815f-fae43a49e357.png?resizew=151)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3ee8456443402a25b1e25d35ff7e1c98.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/385444d07829ee543d288094b0425011.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/29/1d25cc95-d0a3-4d9c-815f-fae43a49e357.png?resizew=151)
A.![]() | B.![]() | C.![]() | D.![]() |
您最近一年使用:0次
名校
10 . 如图,在正方体
中,P为
的中点,则
在该正方体各个面上的正投影(实线部分)可能是( )
![](https://img.xkw.com/dksih/QBM/2020/2/27/2408261420736512/2408927830556672/STEM/a8422126ae904cc8aaacb2bdd05ca773.png?resizew=523)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9fe734023d4e70010a6b2cc3267cb86e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ab13ef156d034b710d811e09b0be34.png)
![](https://img.xkw.com/dksih/QBM/2020/2/27/2408261420736512/2408927830556672/STEM/a8422126ae904cc8aaacb2bdd05ca773.png?resizew=523)
A.①④ | B.①② | C.②③ | D.②④ |
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2020-02-28更新
|
340次组卷
|
4卷引用:湖北省华师一附中2017-2018学年高一下学期期中数学试题