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图形变换是“课标”中比较重要的内容,既要用到全面的基础知识,又要对知识灵活运用.因此在各类考试中,对四边形有关知识的考查,常在折叠(轴对称)、平移、剪拼、旋转(以后将学到)等变化着的状态中进行.学习这部分内容,应在了解各种特殊四边形(平行四边形、矩形、菱形、正方形、梯形等)的基本性质及判定的基础上,加强知识的综合应用.在观察、探索、推理、判断的基础上,运用转化、数形结合、方程等思想方法解决问题.
Graphic transformation is the more important content in “Course Standard”, which not only needs comprehensive basic knowledge, but also applies knowledge flexibly.Therefore, in all kinds of examinations, the related knowledge of quadrilateral is often folded Symmetry), translation, clipping, rotation (to be learned later), etc. Learning this part should be based on an understanding of the basics of various special quadrilaterals (parallelograms, rectangles, diamonds, squares, trapezoids, etc.) On the basis of observation, exploration, reasoning and judgment, this paper applies the methods of thinking, such as transformation, combination of forms and equations, to solve the problem.