已知三棱锥P﹣ABC的体积为10.5,且AB=6,AC=BC=4,AP=BP=10,则PC长度为______ .
2022高三·全国·专题练习 查看更多[1]
(已下线)专题10立体几何初步必考题型分类训练-1
更新时间:2022-11-08 06:20:39
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【推荐1】在正四面体
中,M为PA边的中点,过点M作该正四面体外接球的截面,记最大的截面半径为R,最小的截面半径为r,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd05adb62374d8ee90daef4a823650c.png)
_________ ;若记该正四面体和其外接球的体积分别为
和
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa4c480d031dedac6e81872836d04cc.png)
_________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3bd05adb62374d8ee90daef4a823650c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c4764374bd2fb78e59cd0b283637baeb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c63055a5d6916f99d07fede49120753f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/caa4c480d031dedac6e81872836d04cc.png)
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【推荐2】如下图所示,三棱锥
外接球的半径为1,且
过球心,
围绕棱
旋转
后恰好与
重合.若
,则三棱锥
的体积为_____________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2205cffebf8c4d5f81d15ed7b85c8936.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bd33764ff4efddfe11a98a609753715c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4fbfcae2cecc98e2d6c16dde6d3ec1c1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/08aa6fd52f3933cbded9ce8c880b4a10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://img.xkw.com/dksih/QBM/2020/11/16/2594426834452480/2596241892573184/STEM/3e68374eb3bc4c6194b5cec689f03b14.png?resizew=115)
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【推荐1】如图,在四棱锥
中,底面
是矩形,
为棱
的中点,且
为棱
上的一点,若
与平面
所成角的正弦值为
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1039601edd7326b628a3201a3d4af948.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1c1768e994eab478314beb610cf13436.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/03902478df1a55bc99703210bccab910.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b8f022218ee8f8a1679cae7c733412c6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a6e2867f32d3f1c3cd36cd3a11a8580.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e69d2b798744645af88a4fa411344a83.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5000fea066102e62cf2128ccbbd2b3e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/802e162b98c280720fcb909cf392fda3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1039601edd7326b628a3201a3d4af948.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/11/25/3ac40425-393d-454a-a9bf-72c90b0308d8.png?resizew=159)
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【推荐2】在四面体
中,
是正三角形,
是直角三角形且
,若点
是侧面
内一动点,且满足
,则
点所形成的轨迹长度是___________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/15c0dbe3c080c4c4636c64803e5c1f76.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ac451db3443cabb204f96c31fd4a02e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/443c302c5a860c386c4fa82e48821fc1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9dfaad4c4467e27421876d8f2a4371d2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e5ea309886e947ea7cb4b81716206fd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
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【推荐1】如图,在梯形ABCD中,
,
,
,
,将
沿对角线BD折起,设折起后点
的位置为
,并且平面
平面BCD.则下面四个命题中正确的是______ .(把正确命题的序号都填上)
①
;②三棱锥
的体积为
;③
;④平面
平面
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4adf90a8c2b29334cdc5aa5b554991f9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5679a74e9f5506266ab627894ab03243.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ab2a2834d80ff574e79eae8ca8d4e94f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6fe052786101dfcc941480919eb2cecc.png)
①
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f95b78d94be9cf126522b58204b320bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eeb4c6e9a723aa843e6ba62d7c1a3a6c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8d5989c84e320b504511f23eeb6e7357.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/97eea5144ef3750d3b75c86a008319aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/53d138354c4e021ac8ae2a2fb176ca14.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff8c968d4a1798957d5134b45f5049d0.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/30/c2c25ad4-4d3a-419b-a3a4-57b0c220b229.png?resizew=312)
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【推荐2】如图,棱长为1的正方体
中,
为线段
上的动点(不含端点),则下列结论正确的序号是______ .
![](https://img.xkw.com/dksih/QBM/2022/5/29/2989929515212800/2993236233740288/STEM/dc2d9aac-b378-405d-b346-f6f45bb54e9e.png?resizew=153)
①平面
平面
; ②
的取值范围是
;
③三棱锥
的体积为定值; ④
.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e26d9636ad77369535852c6e4493446a.png)
![](https://img.xkw.com/dksih/QBM/2022/5/29/2989929515212800/2993236233740288/STEM/dc2d9aac-b378-405d-b346-f6f45bb54e9e.png?resizew=153)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dbc3141b0ee5994a18e725bbd8a79d69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/36118a9e86f87ae75f554f8a3fcdb39d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc6913da03b6e87d163d17c1dc34295c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c0bb82965d5b3c7426b5fc82f5edeb7d.png)
③三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/894fcea66eb492bec09c11f106b9b4fa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f7fe8889c7ac022128a40c633282de4b.png)
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