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在解(证)有关两个圆相切的问题时,有一条最常用的辅助线是公切线.通过巧添公切线就把两个圆沟通了,从而达到妙证几何题的目的.本文列举几例说明添公切线在证题中的应用.
When solving the problem concerning the tangency of two circles, one of the most commonly used auxiliary lines is the public tangent line. The two circles are communicated through the coincidence of the public tangent line, so as to achieve the purpose of subtlety geometric problems. Several examples illustrate the application of Tim’s tangent line in the certificate.