“空间与图形”是新课程标准四大学习领域之一。其中几何图形的认识是该领域最基础的知识。通过对几何图形的教学,使学生逐步形成简单几何形体的形状、大小和相互位置关系的表象,培养其进行比较、分析、综合、抽象、概括 “Space and Graphics ” is one of the four major areas of learning for the new curriculum standard. Among them, the knowledge of geometry is the most basic knowledge in this field. Through the teaching of geometry, students gradually form the appearance of the shape, size and mutual position of simple geometric shapes, train them to compare, analyze, synthesize, abstract, generalize