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ΔABC中四個全等圓, 它們彼此相切，其中三個在外面圓與ΔABC相切, 試問全等圓的半徑r是多少？
What is the radius r of the four congruent circles in ∆ABC that tangent to each other and three outer circles of them that tangent to ∆ABC?
這個連結-https://memoryformany.com/applications 有解答。
This link - https://memoryformany.com/applications has one of the answers.
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