所谓“旋转、相似”是指“旋转”变换和“相似”变换的组合;即由一个图形经过适当放缩后再旋转或先旋转后再放缩得到另一个图形的变换过程.在教材中,“旋转”和“相似”是属于两个不同的教学内容,由于版本区别,“旋转”内容有的版本安排在七年级下,有的版本安排在八年 The so-called “rotation, similarity” refers to the combination of “rotation” and “similar” transformations; that is, a graphic is scaled and then rotated or rotated and then zoomed to obtain another graphic’s transformation. Process. In textbooks, “rotation” and “similarity” are two different teaching contents. Due to version differences, some versions of the “rotation” content are arranged under the seventh grade, and some versions are arranged in the Eight years