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在解决梯形有关问题时,常常需要添加辅助线,将梯形问题转化为平行四边形和三角形问题,梯形的辅助线作法很多,这里举例介绍几种常见的辅助线作法.
When solving trapezoidal problems, it is often necessary to add auxiliary lines to convert trapezoidal problems into parallelograms and triangles. There are many methods for trapezoidal auxiliary lines. Here are some examples of common auxiliary lines.