再加一解，不用相似，延长BD, AO交于E后，在三角形ABE中，也用勾股定理可求出半径，代回前一式勾股定理可求DO

来源: 万斤油于 2022-05-05 20:07:10 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

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