2024·全国·模拟预测
解题方法
1 . 已知正方体
的棱长为1,
为
的中点,则三棱锥
的外接球的表面积为( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a1b479d85c1c4237b51084e68544dab.png)
A.![]() | B.![]() | C.![]() | D.![]() |
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2 . 已知四棱台
的底面为正方形,棱
底面
,且
,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5845ccc0d735dc14c92a8926d9b1def6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9f9f87d7152df759c09b5ea5a27c6d7b.png)
A.直线![]() ![]() |
B.若直线![]() ![]() ![]() ![]() ![]() |
C.平面![]() ![]() |
D.若点![]() ![]() ![]() ![]() |
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