試解

來源: 萬斤油於 2022-05-04 22:08:43 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

延長BD和AO交於E點，由勾股定理和相似三角形，易得AD=DE=25, 因此OD=15

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