长方体
的
个顶点都在球
的表面上,
为
的中点,
,
,且四边形
为正方形,则球
的直径为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cd3304e23f3b0f9569c4140ca89b6498.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.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/0a0268d04b9dea7629af27af9a0285a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44130573d3cf84f55d0e2e83d2b51b9a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab3e0dba5705e1d749cfb21ebbb2ed93.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
更新时间:2018-07-31 22:16:27
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【推荐1】在△ABC中,角A的平分线交BC边于D点,且sinC=2sinB,AD=BD=4,则AC=___________ .
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【推荐2】如图,在四棱锥
中,
,底面
为菱形,边长为2,
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与
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【推荐1】《九章算术》中,将底面为长方形且由一条侧棱与底面垂直的四棱锥称之为阳马,将四个面都为直角三角形的三棱锥称之为鳖臑.若三棱锥
为鳖臑,
平面
,
,三棱锥
的四个顶点都在球
的球面上,则球
的表面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bef5239ddbb0972700ce01daf9ee7cf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7a4225479a4d2562bbb39109a3e7d86b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
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【推荐2】中国古代数学经典《九章算术》中,将四个面都为直角三角形的三棱锥为鳖臑,若三棱锥
为鳖臑,且
平面
,
,又该鳖臑的外接球的表面积为
,则该鳖臑的体积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
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