梯形作为特殊的四边形,在求解时常常需要转化为三角形或平行四边形等来解决。于是,梯形添加辅助线的方法就成为同学们学习时的一个难点。为此,笔者根据教学中的经验,归纳总结了一个梯形添加辅助线方法的口诀,这里介绍给大家并举例说明之。 Trapezoidal as a special quadrilateral, in the solution often need to be converted to a triangle or parallelogram to solve. Thus, the method of adding auxiliary lines to trapezoids becomes a difficult task for students when they study. For this reason, according to the experience in teaching, the author summarizes a recipe for adding a trapezoidal auxiliary line method, which is introduced here and illustrated by examples.