“网格问题”是指以正方形网格为背景的一类试题,此类问题通常不需要繁杂的计算和繁难的证明,试题背景公平,题型灵活,操作性强,趣味性浓,能较好的体现新课程理念,是近几年中考的热点问题之一。网格问题一般都以基础题的形式出现,利用网格自身的特点进行图形变换作图,图案设计,计算线段的长度或图形的面积,探究图形的变化规律等。近年来,以网格为载体的有关相似形、圆或平面直角坐标系的综合题频频出现,应引起我们的重视。下面仅 “Grid Problem ” refers to a type of test questions with a square grid as the background. Such problems usually do not require complicated calculations and complicated proofs. The background of the questions is fair, the questions are flexible, the operability is strong, the interesting is rich, Can better reflect the concept of the new curriculum is one of the hot issues in recent years. Grid problems generally appear in the form of basic questions, the use of grids for their own characteristics of graphic transformation mapping, pattern design, calculation of the length of the line or the area of ​​the graph to explore the pattern of changes in graphics. In recent years, the grid-based synthesis of similar shape, circle or plane rectangular coordinate system frequently appears, which should arouse our attention. Only below