在长方体
中,
,E为线段AB的中点,若三棱锥
的顶点都在同一球面上,则该球的表面积为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cf556de5c7080886c943642fbcb845f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/88f75f310adf5423210f86fc86b4fe66.png)
更新时间:2023-10-22 00:13:02
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【推荐1】已知圆柱的上底面圆周经过正三棱锥
的三条侧棱的中点,下底面圆心为此三棱锥底面中心
.若三棱锥
的高为该圆柱外接球半径的2倍,则该三棱锥的外接球与圆柱外接球的半径的比值为________________ .
![](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】在三棱锥
中,
,则三棱锥
的外接球的半径为________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fabe8ba42981397bed8c19b46b5aac1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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【推荐1】如图,四棱锥
中,底面四边形
满足:
,
,
,设三棱锥
,三棱锥
的体积分别为
,则
与
的大小关系是: ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
________
,设三棱锥
,三棱锥
的外接球的表面积分别为
,则
与
的大小关系是: ![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e097c8d4c948de063796bd19f85b3a9a.png)
________
(用“>”“=”“<”填空).
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【推荐2】已知正三棱锥
的底面边长为3,其外接球的球心在三棱锥
的内部,且外接球的表面积为
,若D为BC中点,则异面直线PD与AB所成角的余弦值为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/95345846d2dd4dfa042a9093c62a8b82.png)
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【推荐3】球面几何是几何学的一个重要分支,在刚海、航空、卫星定位等方面都有广泛的应用.如图,A,B,C是球而上不在同一大圆(大圆是过球心的平面与球面的交线)上的三点,经过这三点中任意两点的大圆的劣弧分别为AB,BC,CA,由这三条劣弧组成的图形称为球面△ABC.已知地球半径为R,北极为点N,P、Q是地球表面上的两点.
![](https://img.xkw.com/dksih/QBM/2021/5/21/2726086878920704/2748416839475200/STEM/5dd1aa65-4c5b-4587-8aa5-07c5b441854b.png?resizew=196)
①若P,Q在赤道上,且经度分别为东经40°和东经100°,则球面△NPQ的面积为___________ .②若
,则球面
的面积___________ .
![](https://img.xkw.com/dksih/QBM/2021/5/21/2726086878920704/2748416839475200/STEM/5dd1aa65-4c5b-4587-8aa5-07c5b441854b.png?resizew=196)
①若P,Q在赤道上,且经度分别为东经40°和东经100°,则球面△NPQ的面积为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c1ba755ad81393d883a996c91325254.png)
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