解题方法
1 . 如图,长方体
,写出一个可以确保
平面
的条件,并证明.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/231673dd67ab79d3c5da73904ceade1e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0559490a48cdc9908bb228dffb41feca.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/11dbc00a-907c-4912-87de-b6294c9c00b1.png?resizew=155)
您最近一年使用:0次
解题方法
2 . 在
中,两直角边
,
的长分别为9、12,
垂直于平面
,
,求点
到斜边
的距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dd967903ed5a6f640a5b801ec8be0070.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b887d1ee136ff6a805c1b2a9158ac207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
您最近一年使用:0次
3 . 如图,正方体
,求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4645450a006f2c20087486d0833afbb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a211ad5a06b505b8365a62c1946f3cb7.png)
![](https://img.xkw.com/dksih/QBM/2022/9/14/3066353576067072/3066892591702016/STEM/72ca8fe401b14acfae259ffaffce44ea.png?resizew=219)
您最近一年使用:0次
解题方法
4 . 如图,有一根旗杆
高8m,它的顶端A挂有一条长为10m的绳子,拉紧绳子并把它的下端放在地面上的两点(和旗杆脚不在同一条直线上)
,
.如果这两点都和旗杆脚
的距离是6m,那么旗杆就和地面垂直,为什么?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/ed2eb253-4e38-497f-9a3b-4b1386b3c056.png?resizew=178)
您最近一年使用:0次
5 . 如图,已知正方体
的棱长为1.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/038a2bbe-c6fb-4e05-9fa4-0c73cdda3fae.png?resizew=207)
(1)点
到平面
的距离为______ ;
(2)直线
和平面
的距离为______ ;
(3)直线
和平面
的距离为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/038a2bbe-c6fb-4e05-9fa4-0c73cdda3fae.png?resizew=207)
(1)点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/58cc6184b191e6da43911e701121517e.png)
(2)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8cfbc0b5a8fbde804bd8425a4b76d207.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
(3)直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/11ddc92d84d188c66b435664a7e7b5a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
您最近一年使用:0次
6 . 根据下列条件能否判断直线与平面图形所在平面垂直:(能的写正确;不能的写错误)
(1)直线垂直于三角形的两条边.( )
(2)直线垂直于梯形的两条边.( )
(3)直线垂直于圆的两条直径.( )
(1)直线垂直于三角形的两条边.
(2)直线垂直于梯形的两条边.
(3)直线垂直于圆的两条直径.
您最近一年使用:0次
7 . 如图,拿一张矩形纸片对折后略微展开,竖立在桌面上,折痕与桌面的关系是______ .
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/da982a33-e804-47da-8202-af5e85ec2c2e.png?resizew=144)
您最近一年使用:0次
8 . 如图,
在平面
上,OA是
的斜线,若
,
,
,求OA与平面
所成的角.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d22df2977de56cc69be0c1e847653d7a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4387f0fba7185849802737038647b7dd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c53d934a0cd9512e6df17c8f311c3ce4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f144992e1cbee34868abce1e5ad38c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/80f39c07-2301-477f-90d8-9015818f087f.png?resizew=207)
您最近一年使用:0次
解题方法
9 . 如图,在棱长为a的正方体
中,
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/ca149d7a-f4d0-4e33-be9a-5e898c934860.png?resizew=181)
(1)求证:
;
(2)求证:
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/15/ca149d7a-f4d0-4e33-be9a-5e898c934860.png?resizew=181)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9136071c4b1bb2c7c09a49aed7338a09.png)
(2)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/565133e91e3ace2b2187cfc6f1db5be6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
您最近一年使用:0次
解题方法
10 . 如图,已知H是锐角三角形ABC的垂心,
平面ABC,
.求证:
,
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b17622ea6f6f5afd1ad817a557e5889d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cc9b0d3cf342e065b4c8e21443bfbfbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9b9bb0f509e6f3d30858efb217c1f5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a665ba024f2840ce5aef3765249341.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/16/3a6b55e1-7b14-4a16-b7b2-6dce3f072038.png?resizew=165)
您最近一年使用:0次
2022-09-15更新
|
67次组卷
|
3卷引用:沪教版(2020) 必修第三册 经典导学 第10章 10.3 第5课时 三垂线定理