已試，不算太繁，AB建x軸，O上建y軸，小圓半徑r, C點(x,y), 可建3個方程，求出r

來源: 萬斤油於 2022-02-03 22:20:46 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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