《认识图形》是几何平面图形知识教学的起始,需要学生通过一系列操作活动体验长方形、正方形、圆这三种最基本、最常见的平面图形的特征,并形成粗浅认知。在丰富的操作活动中使学生有效体验。片段一:在观察中体验教师出示一幅图画: Cognitive graphics is the beginning of the teaching of geometric graphic knowledge, which requires students to experience the characteristics of the three basic and most common planar graphics such as rectangle, square and circle through a series of operational activities and to form superficial cognition. In a wealth of operational activities to enable students to effectively experience. Fragment one: experience in the observation of teachers to produce a picture: