因為角B是直角，E就是直徑的另一端，即AO=OE, 三角形AOD和DOE全等，DE=AD=25

來源: 萬斤油於 2022-05-06 13:35:15 [博客] [舊帖] [給我悄悄話] 本文已被閱讀：次

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