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教学目标1.让学生初步掌握圆的特征,理解和掌握在同一个圆里半径和直径的关系。会用圆规画圆。2.使学生初步学会运用所学的数学知识解决简单的实际问题。3.培养学生的动手操作能力和观察、分析、综合、概括的能力及其空间观念的建立。教学重点认识圆,掌握圆的特征,了解画圆的步骤和掌握画圆的方法。教学难点归纳圆的特征。课前准备1.学生准备好圆规、直尺、圆纸片。
Teaching Objectives 1. Let students preliminarily grasp the characteristics of the circle, understand and grasp the relationship between the radius and the diameter in the same circle. Will use a compass to draw a circle. 2. To enable students to learn the initial use of mathematical knowledge to solve simple practical problems. 3. Cultivate the ability of students to operate and observe, analyze, synthesize and summarize their abilities and the establishment of their spatial concepts. Teaching focus on understanding the circle, grasp the characteristics of the circle, understand the steps to draw a circle and grasp the method of drawing a circle. Difficult to summarize the characteristics of teaching round. Preparation before class 1. Students are ready for compasses, rulers, round sheets of paper.