一、说教材“圆的面积”是数学第十一册第四单元第三课时的内容。它是在学生认识了圆的特征 ,学习了圆的周长 ,掌握了一些平面图形（如长方形 ,平行四边形等）的特征 ,并形成了一定空间观念的基础上进行学习的。这一内容的安排 ,为将来学习圆柱的有关知识作了必要的铺垫。另外 First, said textbook “circle area” is the tenth unit of mathematics, the fourth unit of the third class content. It learns on the characteristics of the circle, learns the circumference of the circle, masters the features of some plane shapes (such as rectangle, parallelogram, etc.) and forms a certain space based on the concept of learning. The arrangement of this content has paved the way for the future study of cylindrical knowledge. In addition