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[几何] 垂心四面体的五点共球

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lihpb posted 2024-6-9 20:15 |Read mode

垂心四面体ABCD的垂心为H，底面三角形BCD的重心为G，HH'垂直于AG于H'，
则B、C、D、H、H'五点共球

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2025-6-8 06:59 GMT+8

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