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在处理有关两圆相切的问题时,公切线犹如一把万能的钥匙,所以,在遇到两圆相切时,应首先考虑添加公切线.本文以近年中考试题为例分类说明之.
When dealing with the tangency of the two circles, the public tangent is like a universal key. Therefore, when the two circles are tangent, the public tangent line should be considered first.