如图所示,已知四棱锥
的底面
为正方形,且
,
,则四棱锥
外接球的体积为_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4b747200e216995d742000d0880d0933.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3e7f748d88b4eadfd1643c6b31fdf08.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://img.xkw.com/dksih/QBM/2020/8/25/2535471281184768/2542573424721920/STEM/f2a5b05d93fc4116b15b91ba539882ec.png?resizew=143)
更新时间:2020-09-04 16:21:47
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解题方法
【推荐2】“牟合方盖”是我国古代数学家刘徽在研究球的体积过程中构造的一个和谐优美的几何模型,该几何体是由正方体用圆柱从纵横两侧面作内切圆柱体时,两圆柱体的公共部分构成的.已知棱长为
的正方体按上述方法截得的牟合方盖的体积是
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
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【推荐1】已知矩形
,
,
,将
沿对角线
进行翻折,得到三棱锥
,则在翻折的过程中,有下列结论正确的有_____ .
①三棱锥
的体积的最大值为
;
②三棱锥
的外接球体积不变;
③三棱锥
的体积最大值时,二面角
的大小是60°;
④异面直线
与
所成角的最大值为90°.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ced06b71073e1bb777f326f06016ce17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f656e1d1f68954e5f06de8958f6a9310.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7ac5396c5ea442e0364b50c1db3d2da.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
①三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4dac452fbb5ef6dd653e7fbbef639484.png)
②三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
③三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d4357d5744046d4d44abb09e1ee35fcb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3f0ac3005d5ecd6d4cea0ce99a47ef3c.png)
④异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
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【推荐2】在四棱锥P-ABCD中,
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dfd9f1e8b72f611c43523a8fab2928f9.png)
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