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解决梯形的问题,我们常常是通过作辅助线,把它转化成三角形和四边形的问题来解决的.这里举例说明几种常见辅助线的作法,以供同学们参考.
To solve the problem of trapezoid, we often solve it by transforming it into a triangle and a quadrangle by using the auxiliary line as an example to illustrate some common auxiliary lines for reference.