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在高小算术课本第四册《求积》一章中,《圆的周长和面积》、《圆柱的侧面积和体积》、《圆锥的体积》三节是教学的重点。圆、圆柱、圆锥是人们在生产、生活中常遇到的形体,教学这部分教材,使学生掌握关于圆、圆柱、圆锥的一些基本知识和计算技能,发展空间观念,对他们毕业后参加生产劳动和进一步学习都十分必要。现在把我的教学打算写出来,和大家研究。一、圆的周长和面积:这一节教材引进了有关圆的一些概念,讲述了圆的周长和面积的计算方法。教学要求主要是:1.使学生认识圆,知道什么是圆心、圆周、半径、直径,会用工具画圆;2.使学生形成圆周率的概念,掌握它的近似值,知道求圆的周长的公式,能运用公式,根据已知的直径或半径求出圆的周长,根据圆的周长求出圆的直径或半径;3.使学生知
In Chapter 4 of the High School Maths Curriculum, “Surrounding the Circumference and Area,” “Cylindrical Sides and Volumes,” and “The Volume of a Cone,” three chapters focus on teaching. Circles, columns, and cones are the forms people often encounter in their daily lives. They teach this part of the teaching materials to help students master some basic knowledge and computing skills on circles, columns, and cones, to develop the concept of space and to participate in productive labor after graduation And further study are necessary. Now I plan to write my teaching, and we study. First, the circle perimeter and area: This section introduces some of the textbook about the concept of the circle, tells the circle circumference and area calculation method. The main teaching requirements are: 1. Make students know the circle, know what is the center of the circle, circumference, radius, diameter, will use the tool to draw a circle; 2. To enable students to form the concept of pi, grasp its approximate value, Formula, can use the formula, according to the known diameter or radius of the circle obtained from the circle according to the circumference of the circle diameter or radius; 3. To enable students to know