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几何概念是抽象的,教学时必须遵循由形象到抽象的规律,引导学生对具体事物进行观察、辨别和比较,逐步形成概念、巩固概念和应用概念。1.通过实际操作形成概念。认识几何图形,不能由教师下定义。应该引导学生对具体事物进行一系列的感知,然后再概括出图形的特征。如教学长方形的概念时,可以先让学生画几个大小不一、方位不同的四边形:
Geometric concept is abstract, teaching must follow the law from the image to the abstract, to guide students to observe, identify and compare specific things, and gradually formed the concept of consolidation and application of concepts. 1. Through the actual operation of the concept. Understand the geometry, can not be defined by the teacher. Students should be guided a series of perceptions of specific things, and then summarize the characteristics of graphics. Such as the concept of rectangular teaching, students can first have to draw a number of different sizes, different orientation of the quadrilateral: