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变换是处理图形问题的有力工具,利用变换的观点和思想方法,可以将八年级上学期所学的几何内容自然地整合在一起,进而达到融会贯通的学习目的.一、平移、旋转、轴对称的性质要点 1.轴对称关于某条直线对称的两个图形是全等形,轴对称图形上任意对应的两点到对称轴的距离相等,而且对应两点的连线垂直对称轴,对应的线段和对应的角分别相等. 2.平移平移不改变图形的形状和大小,平移前后的图形对应点连
Transformation is a powerful tool for dealing with graphic problems. By using transformation perspectives and methods of thinking, it is possible to naturally integrate the geometry content learned in the last semester of grade 8 and achieve the goal of merging learning. 1. Translation, rotation, axisymmetrical Nature Points 1. Axisymmetrical The two symmetries about a line are isomorphic, and the distance between any two corresponding points on the axisymmetric figure to the symmetry axis is equal, and the vertical symmetry axis of the line connecting the two points corresponds to the line segment. The corresponding angles are equal. 2. The translation does not change the shape and size of the graph.