这都是一个问题而已，作一圆与三定圆相垂

来源: Mushy 于 2008-10-08 02:49:43 [档案] [旧帖] [给我悄悄话] 本文已被阅读：次 (277 bytes)

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作一圆与三定圆相垂,叫做Appollonius Problem. the solution I gave, which you have not acknowledged, is Appollonius's solution: that why the name appollonius circle.

on an inversive plane, points and line are circles. so all the examples are just special case of that.