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[几何] 圆内接五边形 求证两圆相切

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hbghlyj Posted at 2024-12-29 06:02:01 |Read mode
设 $A_1​​A_2A_3A_4A_5$ 为圆内接五边形,
设 $B_i=A_{i-1}A_{i} \cap A_{i+1}A_{i+2}$ 其中 $i=1, 2, 3, 4, 5$.
设 $O_i$ 为通过 $B_i, A_{i+2}, A_{i+4}$ 的圆.
设 $C_i=O_{i+1} \cap O_{i+4}$ 其中 $i=1, 2, 3, 4, 5$.
求证:两个圆 $\odot{(A_1B_2B_4)}$ 和 $\odot{(A_1C_1C_5)}$ 在 $A_1​​$ 处相切
$type tid=13247.ggb (52.48 KB, Downloads: 34)
Screenshot 2024-12-28 220107.png

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