已知下列几何体三视图如图.
(2)求该几何体外接球的体积.
(2)求该几何体外接球的体积.
更新时间:2021-02-05 21:32:46
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【推荐1】某三棱锥的三视图如图所示,该三棱锥的表面积是多少?
![](https://img.xkw.com/dksih/QBM/2020/6/25/2492403177824256/2493004968402944/STEM/9b564632-a235-41f5-a441-a77df875e512.png?resizew=315)
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【推荐2】如图是一个几何体的三视图,根据图中数据,求该几何体的表面积和体积.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/26/e1f1331c-6bb7-48e3-9bfe-dbe373bc105e.png?resizew=120)
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【推荐1】正三棱锥的底面边长为a,侧面间的二面角为
,求它的侧面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e170f206fdbbd834aad7580c727e2cc6.png)
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【推荐2】如图,在四棱锥
中,
平面
,底面
是平行四边形,
,
,
是
上的动点.
(1)求证:平面
平面
;
(2)求四棱锥
的侧面积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccd4fd4b7a4d6b8ca0c5827c055a9ce7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca37feb165ab4711a42c47fe929e5624.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/364d6c88726d8c3bb8ed297057332bac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
(1)求证:平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6d077f6da8b2c00b152d4679aa2ed7f7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/926584088b939200d88e64318f2d4e6c.png)
(2)求四棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/12/11/63bad7b9-4f45-4f9e-906e-e0e7bc58a371.png?resizew=186)
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【推荐1】三棱锥
的三视图如图所示,
.
![](https://img.xkw.com/dksih/QBM/2020/4/1/2431985546002432/2433018858274817/STEM/c1fdcfcfbb5c461280a88e55adf05f93.png?resizew=203)
(1)求该三棱锥的表面积;
(2)求该三棱锥内切球的体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/45acdbac251ca6b76a166c1242e71df9.png)
![](https://img.xkw.com/dksih/QBM/2020/4/1/2431985546002432/2433018858274817/STEM/c1fdcfcfbb5c461280a88e55adf05f93.png?resizew=203)
(1)求该三棱锥的表面积;
(2)求该三棱锥内切球的体积.
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【推荐2】用两个平行平面去截半径为
的球,两个截面圆的半径分别为
,两截面间的距离
,求该球的表面积和体积.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4028b31015a30d1634bbee048e73d7f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf88fa6a2213a7297a08ff2be2c2c2ae.png)
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适中
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【推荐1】如图,在四棱台
中,
平面ABCD,底面ABCD是平行四边形,
,![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://img.xkw.com/dksih/QBM/2015/2/5/1571979556749312/1571979562737664/STEM/b7171a6500244b7e95331bf81684b128.png?resizew=264)
(1)证明:
;
(2)若AB=2,且二面角
大小为60°,连接AC、BD,设交点为O,连接B1O,求三棱锥B1—ABO外接球的体积.(球体体积公式:
,R是球半径)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/13dfda77ecf61013170a6f43b4d9d116.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9ddbb0422a136f45653c8c369f2d75fc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a70704be2a2ac7bee6865ed51fe8fcd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6906f59d09ce31956d6f5ea2b23fc77.png)
![](https://img.xkw.com/dksih/QBM/2015/2/5/1571979556749312/1571979562737664/STEM/b7171a6500244b7e95331bf81684b128.png?resizew=264)
(1)证明:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a27bad0636a087e38bb1d253d66a231d.png)
(2)若AB=2,且二面角
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f9c6ee40dff32baf8ffbf3cd4562c25a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca331ac8409eeb1d0ebf4219f1b1511.png)
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解答题-证明题
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【推荐2】如图1,在正方形
中,点
,
分别为
,
的中点,
与
交于点
,点
,
分别在线段
,
上,且
,将
,
,
分别沿
,
,
折起,使点
,
,
重合于点
,如图2所示.
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/9d25fbf5-0b64-41b4-b985-5666269001da.png?resizew=282)
(1)求证:
平面
;
(2)若正方形
的边长为
,求三棱锥
的内切球的半径.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d40b319212a7e7528b053e1c7097e966.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/73465a1f9aa03481295bf6bd3c6903ac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa0df7f1e45f9de29e802c7f19a4f64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c7e4fa04825ac7d071968056322d88be.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ca14f6100d829f197a5dac5197bbe0b1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d37a5ad5e7999cfbb9e106257519bcc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c771a4feb150ad9cff8d70431c97eb17.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebdda64e2dd89a47e4f4e137c229607c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e6e490f703eb6c9bb1278c78ebc2d661.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/9/6/9d25fbf5-0b64-41b4-b985-5666269001da.png?resizew=282)
(1)求证:
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4cbcd5cd33ce6cb040b353599893aa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d246f9eceab371ebf47a47c2f11a4ad.png)
(2)若正方形
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8860d9787671b53b1ab68b3d526f5ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/16fd1bc6147d69777b26a35d48522f7e.png)
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【推荐3】如图,已知在正三棱柱
中,
,三棱柱外接球半径为
,且点
分别为棱
,
的中点.
(1)过点
作三棱柱截面,求截面图形的周长;
(2)求平面
与平面
的所成角的余弦值.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeed487430a5b8a330f2d0c52166521a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2933e6e1635d0399ce29b2e5191841a4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad056c25c0fdcbcc765eb5cbc6093f2b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a851907ada2ac2c3c4880a6736d28a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0f1f229274a6e17977cc047814212589.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/1/3/28f8deda-1382-414a-a2f3-2eb2300bd192.png?resizew=140)
(1)过点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f8e45b50c77bf6a2cde628ea3455ac9.png)
(2)求平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b03428a8f91a5674cb8f54766c165f7e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e168672b47d7e64dc1b404f8882c7dcf.png)
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