解题方法
1 . 如图,四棱锥
的底面是正方形,
为
的中点,
,
,
,
.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/219a5232-8e86-4a15-9bcc-a246b0f00165.png?resizew=169)
(1)证明:
平面
.
(2)求三棱锥
的侧面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19a4b8b69b419c557ba61a2bdfaf4066.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fdf359f763ba9cecb6086408c91db6e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c1364213f546b37f8764ddcb59e36ae4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7e0f73b3c63084d9c032802e01f9a168.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e1b638760d907efe836500581da1596.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/10/25/219a5232-8e86-4a15-9bcc-a246b0f00165.png?resizew=169)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca5dd496ee0c1170ef6dcc48266ee444.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/80f747eb5b2d21c9de962cbfd4ec4bb7.png)
(2)求三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/399ca97f2ce0c4f8fcf1d1cb8b3a3cec.png)
您最近一年使用:0次
2020-05-02更新
|
532次组卷
|
3卷引用:2020届辽宁省辽阳市高三一模考试数学(文)试题
2 . 设
为一个圆柱上底面的中心,A为该圆柱下底面圆周上一点,这两个底面圆周上的每个点都在球O的表面上
若两个底面的面积之和为
,
与底面所成角为
,则球O的表面积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a7b880ae90acc140185f152906f2be5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c90282d4a37c9a20620d4bbb0c263cae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5123f873f55634302e33e1cca519fbbc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ca01bd0426330be7b5a31633ba3d927.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fe8dc472dade6cea6943164792ab532.png)
您最近一年使用:0次
2019-01-04更新
|
455次组卷
|
6卷引用:【市级联考】辽宁省辽阳市2019届高三上学期期末考试数学(理)试题