点M是棱长为2的正方体
的内切球O球面上的动点,点N为BC边上中点,若
,则动点M的轨迹的长度为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0145c53cde685377b13e83f8e1c60658.png)
21-22高一下·四川雅安·期末 查看更多[3]
更新时间:2022-07-12 18:40:47
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【推荐1】半径为2的球面上有三点
,满足
,若
为球面上任意一点,则三棱锥
体积的最大值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24e0c10fb103930eabd5fa18e8f9bb06.png)
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【推荐2】已知正四面体
的表面积为
,
为棱
的中点,球
为该正四面体的外接球,则过点
的平面被球
所截得的截面面积的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】正三棱锥的高为
,底面边长为
,则此三棱锥的体积为______________ ;若有一个球与该正三棱锥的各个面都相切,则球的半径为______________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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【推荐2】在棱长为
的正方体
中,动点
在平面
上运动,且
,三棱锥
外接球球面上任意一点
到点
到的距离记为
,当平面
与平面
夹角的正切值为
时,则
的最大值为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bdaa19de263700a15fcf213d64a8cd57.png)
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【推荐1】如图所示,已知圆柱
的轴截面
是边长为
的正方形,球
在圆柱
内,且与圆柱
的上、下底面均相切.则球
的表面积为________ ;若
为圆柱下底面圆弧
的中点,则平面
截球
所得截面的周长为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e65ac334119ccd6204402a7aba29a55.png)
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【推荐2】如图,正方体ABCD-A1B1C1D1的棱长为2,点O为底面ABCD的中心,点P在侧面BB1C1C的边界及其内部运动.给出下列四个结论:
![](https://img.xkw.com/dksih/QBM/2022/3/29/2946843240095744/2948092220235776/STEM/d21ea475aa5b4c41b813e6f5e674cad1.png?resizew=184)
①D1O⊥AC;
②存在一点P,D1O∥B1P;
③若D1O⊥OP,则△D1C1P面积的最大值为
;
④若P到直线D1C1的距离与到点B的距离相等,则P的轨迹为抛物线的一部分.
其中所有正确结论的序号是_________________ .
![](https://img.xkw.com/dksih/QBM/2022/3/29/2946843240095744/2948092220235776/STEM/d21ea475aa5b4c41b813e6f5e674cad1.png?resizew=184)
①D1O⊥AC;
②存在一点P,D1O∥B1P;
③若D1O⊥OP,则△D1C1P面积的最大值为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2967337e3fcb228dded64ab0c41a17e0.png)
④若P到直线D1C1的距离与到点B的距离相等,则P的轨迹为抛物线的一部分.
其中所有正确结论的序号是
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【推荐3】四棱锥
的底面
为正方形,
平面
,且
,
.四棱锥
的各个顶点均在球O的表面上,
,
,则直线l与平面
所成夹角的范围为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
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【推荐1】四棱锥P-ABCD各顶点都在球心为O的球面上,且PA⊥平面ABCD,底面ABCD为矩形.
,
,则球O的半径是__________ ;设M、N分别是PD、CD的中点,则平面AMN截球O所得截面的面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8c2753753faf2cb9a0003aa8e3945159.png)
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【推荐2】我国古代数学著作《九章算术》中记载:斜解立方,得两堑堵.其意思是:一个长方体沿对角面一分为二,得到两个一模一样的堑堵.如图,在长方体
中,
,
,
,将长方体
沿平面
一分为二,得到堑堵
,下列结论正确的序号为______ .
①点C到平面
的距离等于
;
②
与平面
所成角的正弦值为
;
③堑堵
外接球的表面积为
;
④堑堵
没有内切球.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efc6e4b936d7a800e839a30c3839574d.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5b14d74bdf9ed7c45b2e754b7ccc4f.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/4/2/203cf047-3c7e-43ff-9a8e-fb0157d5f7d4.png?resizew=233)
①点C到平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/679748eab882a6be0fefd2cc300349a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81365a3726621b6557bd26f3a1a51cae.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/588eb9393564a33552c4b2e8de837ca5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15a24acb11fac4bcf6a86e3e9223a48b.png)
③堑堵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5b14d74bdf9ed7c45b2e754b7ccc4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f08a01aed02ce1eaf1aaefaa0342b7ad.png)
④堑堵
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b5b14d74bdf9ed7c45b2e754b7ccc4f.png)
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