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我在扇形面积的教学中,注意引导学生独立思考、分析,自己去发现和解决问题,取得了较好的效果。我在教课之前,安排学生阅读课本,预习圆心角、弧、扇形等概念。上课时,先提问,加深理解,使课堂教学集中在推导扇形面积的计算公式上。然后,我提出一个问题:圆心角是1°的扇形面积与圆面积的(1/360)有没有联系?有什么联系?让学生看课本,寻求答案。同学们各抒己见。有一位
In teaching fan-shaped area, I pay attention to guiding students to think independently and analyze, find and solve problems on their own, and achieved good results. Before I taught, I arranged for students to read textbooks, preview the concept of central angles, arcs and sectors. Class, the first question, deepen understanding, the classroom teaching focused on the derivation of fan-shaped area of the formula. Then, I ask the question: Is there any connection between the sector area with a central angle of 1 ° and (1/360) the area of a circle? What is the link? Have students look at the textbook and seek answers. Students express their opinions. There is one