论文部分内容阅读
一、说教材(一)、说课内容九年义务教育六年制第十一册四单元第二节《圆的周长》。圆的周长是在学生掌握了平面直线图形的周长与面积的计算方法,以及学生认识了平面曲线图形——圆,掌握了圆的特征,学会用工具画圆的基础上教学的。本节课学习圆周长的概念、圆周率的意义、圆周长的计算公式,为进一步学习圆面积和立体几何图形——圆柱和圆锥打下良好的学习基础。在日常生活中,我们常常遇到求圆周长的问题,如果学生掌握了圆周长的计算方法就可以提高他们解决实际问题的能力,所以学习圆的周长就显得十分必要。(二)、教学目标1.理解圆周率的意义,掌握圆周长计算公式,能正确计算圆的周长,并能解决一些简单的实际问题。2.通过对圆周率值的探求,培养学生科学的和实事求是的探索精神,培养学生的概括能力和思维
First, the textbook (a), said the contents of the nine-year compulsory education six years of eleventh four units section second “circle circumference.” The circumference of the circle is calculated on the basis of the students ’grasp of the perimeter and area of the planogram and the students’ understanding of the plane curve-circle, mastered the characteristics of the circle, and learned to draw the circle on the basis of the tool. This lesson to learn the concept of circumference, the meaning of the circumference, the circumference of the calculation formula for further study of circular area and the three-dimensional geometry - cylinder and cone to lay a good foundation for learning. In our daily life, we often encounter the problem of seeking the circumference. If students grasp the method of calculating the circumference, they can improve their ability to solve practical problems. Therefore, it is necessary to study the circumference of the circle. (B), the teaching objectives 1. Understand the significance of the pi, grasp the formula of the circumference, the circle can be correctly calculated circumference, and can solve some simple practical problems. Through the exploration of the value of the pi, students develop scientific and realistic spirit of exploration, develop students’ abilities and thinking