梯形是一种不同于平行四边形的特殊四边形,在各地的中考试卷中,对梯形进行考查的题目难度不一,题量不等,但大多是通过添加辅助线,转换为其他四边形或三角形来求解或求证.例1(襄樊市·2004)我们在研究等腰梯形时,常通过作辅助线,将等腰梯形转化为三角形,然后用三角形的知识来解 The trapezoid is a special quadrilateral different from a parallelogram. In various local examination papers, the problem of examining trapezoids is not the same, and the amount of questions varies, but most of them are solved by adding auxiliary lines and converting to other quadrilaterals or triangles. Or verification. Example 1 (Xiangfan City, 2004) When we study isosceles trapezoids, we often use auxiliary lines to convert isosceles trapezoids to triangles, and then use triangle knowledge to solve