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阿波羅尼斯問題：與三圓相切的圓
Author:
羅驥韡 (Pegasus Roe)
阿波羅尼斯問題：與三圓相切的圓
GeoGebra
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找出對稱軸
算柱 (兩位數)
近似值：有效數字
sanjiaohanshu
兩組對邊相等和有直角的四邊形
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