正三棱锥侧棱长为
,侧棱与底面所成角为
,则它的体积为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d07ae0b4264da6a8812454ffd2f20d94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/81e0693c9af0e3e4da2c8f18f45cdccc.png)
更新时间:2023-02-06 09:16:01
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【推荐1】刻画空间弯曲性是几何研究的重要内容,用“曲率”刻画空间弯曲性,规定:多面体顶点的曲率等于
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