如图,AB是
的直径,PA垂直于
所在的平面,C是圆周上不同于A,B的任意一点,
,三棱锥P-ABC体积的最大值为
,则当△PBC的面积最大时,线段AC的长度为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3d97cdc586744d208b6f69c9813af977.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/31571febbf2af2957fab1a173f5fcf12.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a391005600bdd69c96750589f9adb048.png)
![](https://img.xkw.com/dksih/QBM/2022/1/12/2892757150048256/2915707766153216/STEM/f31acdf62d724f74834099acebf268b0.png?resizew=156)
更新时间:2022-02-13 20:45:32
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【推荐1】已知三棱锥
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【推荐2】已知三棱锥
的外接球的球心
恰好是线段
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【推荐1】如图,已知正三棱柱
的各条棱长都相等,
是侧棱
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d88bf46ad08f9677c37eed1d0369329.png)
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【推荐2】(1)三角形的一边
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![](https://img.xkw.com/dksih/QBM/2021/9/12/2806673369604096/2807297368162304/STEM/a8380a2844da4e3a9ebad5397bda19eb.png?resizew=123)
(2)直角三角形
的斜边
在平面
内,直角顶点
在平面
外,
在平面上的射影为
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
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