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[几何] 已知四面体三个面面积和两两所夹的二面角,求体积

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lihpb Post time 2023-12-30 11:43 |Read mode
证明这个公式

QQ图片20231230112747.png

之前帖子的顶点角写错了,是二面角,我看成了线线角

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hejoseph Post time 2024-1-5 16:41
跟这里发的方法差不多啊,
kuing.cjhb.site/forum.php?mod=viewthread&tid=11764
三面角第一余弦定理换成第二余弦定理就得了。

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