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一、要点扫描 1．平移的性质 (1)平移前后两个图形形状和大小完全相同． (2)新图形中的每一个点都是由原图形中某一对应点平移后得到的． (3)连接各组对应点的线段平行且相等． 2．旋转的性质 (1)图形中的每一个点都绕旋转中心旋转了同样大小的角度． (2)每组对应点到旋转中心的距离相等,对应线段相等,对应角相等．
First, the main point of scanning The nature of translation (1) The shape and size of the two figures are exactly the same before and after the translation. (2) Each point in the new graph is obtained by translation from a corresponding point in the original graph. (3) The line segments connecting the corresponding points of each group are parallel and equal. 2. The nature of the rotation (1) Each point in the graph is rotated about the center of rotation by the same amount of angle. (2) The distance from each corresponding point to the center of rotation is equal, the corresponding line segment is equal, and the corresponding angle is equal.