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旋转变换是指将某一图形(或图形的一部分)在同一平面内绕某定点旋转定角,得到与原图形全等的图形的数学思想方法.通过图形的旋转,使某些元素(线段或角)相对集中,以利于问题获解.实施旋转变换的前提条件是有公共端点的两等长线段.因此,凡涉及等腰三角形、等边三角形、正方形、菱形及中心对称等线段问题,解题时常可考虑旋转变换,而旋转角的大小,常需具体情况具体分析.
Rotational transformation refers to the mathematical thinking method of getting a certain figure (or a part of a figure) on the same plane by rotating a fixed angle around a certain point to obtain a figure congruent with the original figure. Through the rotation of the figure, some elements Angle), so as to facilitate the solution of the problem.The prerequisite for the implementation of rotation transformation is that there are two equal length segments of the common endpoint.Therefore, all the problems involving isosceles triangle, equilateral triangle, square, diamond and center symmetry are solved Questions often consider rotating transformation, and the size of the rotation angle, often require specific analysis of the specific circumstances.