一、关于“圆的认识”课堂实践中,“圆的认识”这一教学内容的展开大致有两种:一是教材中的(苏教版):集中认识圆心、半径、直径,对其进行描述性定义,再相对集中地通过一些学习方式来认识半径、直径的一些特征和相互关系。二是老师们常常采用相对分散的方法,先认识半径,探 First, on the “circle of understanding ” classroom practice, “circle of understanding ” This teaching content to start there are two: First, the textbook (Sujiao Version): focus on understanding of the heart, radius, diameter , Define it descriptively, and then learn some characteristics and interrelations of radius and diameter through some learning methods. Second, teachers often use a relatively decentralized approach, first understand the radius, exploration