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湘阴县城西小学聂珮珂老师,在教学扇形面积时,运用“四步整体教学”的方法,收到了良好的教学效果。第一步:铺垫 1.提问。直角、平角、周角各是多少度?直角、平角与周角之间的关系如何? 2.讲述。上节课我们学习了“圆面积的计算”.今天我们要在上节课学习内容的基础上,学习一种新的图形。(出示扇形图,问)这种图形象什么东西?(象一把折扇,教师出示折扇)这样的图形,给它取一个什么名字好呢?(扇形,因为它象扇子)。这个名字取得好(板书“扇形”)。那么,究竟什么样的图形叫扇形?怎样计算扇形面积呢? 3.自学。学生自学五年制小学数学第十册第11页
Nie Xianke Primary School in Xiangyin County teacher, teaching sector area, the use of “four-step overall teaching” approach, received a good teaching results. The first step: Mat 1. Ask questions. Right angle, angle, angle is how many degrees? Angle, angle and how the relationship between the angle? In the previous lesson, we studied “Calculation of the Circle Area.” Today we will learn a new kind of graphic based on the contents of the previous lesson. (Show a pie chart and ask) What is the shape of the figure? (Like a folding fan, a teacher producing a fan) What is the name given to it? The name is good (blackboard fan). So, what kind of figure is called fan? How to calculate fan area? 3. Self-study. Student self-study elementary school mathematics tenth volumes of the first eleventh