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[几何] 内心证明相似

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Tesla35 Posted at 2024-12-27 10:17:25 |Read mode
Last edited by hbghlyj at 2025-3-20 06:20:41点 $I$ 是 $\triangle A B C$ 的内心,过 $I$ 作 $I D \perp B C$ 交 $\odot O$ 于点 $D$ ,连结 $A D$ 交 $B C$ 于 $E$求证 $I D^2=D E \cdot D A$
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爪机专用 Posted at 2024-12-27 11:30:59 From the mobile phone
I am majia of kuing

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 Author| Tesla35 Posted at 2024-12-27 11:40:18
爪机专用 发表于 2024-12-27 11:30
https://kuing.cjhb.site/forum.php?mod=viewthread&tid=11334
原来如此

手机版Mobile version|Leisure Math Forum

2025-4-21 01:19 GMT+8

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