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证明圆内比例线段(含等积式)类型较多,且方法灵活,由等积式(含比例线段)运用“三点定形法”选择相似三角形进行证明是最基本的方法.
It is proved that there are many types of scale segments (including isomorphism) in the circle, and the method is flexible. It is the most basic method to prove that the equal triangle is selected by using the “three-point fixed shape method” in the isomorphism (including proportional line segments).