[几何] 四棱锥各侧面的垂心共面且共圆

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hbghlyj posted 2020-7-31 22:10 |Read mode

在四棱锥P-ABCD中,AC⊥BD,AC∩BD=O,PO⊥底面ABCD. E、F、G、H分别为各侧面的垂心.求证: E、F、G、H四点共面且共圆
等面三面角.png

梅涅劳斯定理

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2025-6-8 06:39 GMT+8

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