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梯形是一种常见的四边形,梯形试题在各类考试中屡见不鲜.解决此类问题的基本思想是通过添加辅助线,将梯形问题转化为三角形或平行四边形(包括特殊的平行四边形),然后利用这些图形的性质使问题最终得以解决.现以09年北京
Trapezoid is a common quadrangle, trapezoid test is commonly found in various exams.The basic idea to solve this kind of problem is to convert the trapezoid problem into triangle or parallelogram (including special parallelogram) by adding auxiliary lines, and then use these The nature of the graphics so that the problem can be finally solved. Now in 2009 in Beijing