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【教学内容】浙教版六年级上册《圆的周长和面积》单元的一节提高练习课。【教学重点】掌握圆沿正方形、长方形、三角形等多边形和圆的边缘无滑动地滚动一周,圆心所经过的路程和圆所扫过的面积的计算方法。【教学难点】理解点动成线,线动成面。【教学准备】白板课件。【教学过程】一、视频材料“滚铁环”引入师:请大家看一段视频。(滚铁环)(边欣赏边提问:这是在干什么)师:在这个滚铁环游戏中,什么在发生变化?什么没有变?(出示课件,演示圆的位置在变,圆心到接触点的距离没有变。并出示课题——运动中圆的周长和面积)
【Teaching content】 Zhejiao edition sixth grade on the volume “circle circumference and area” unit of a section to improve practice class. [Teaching Points] To grasp the circle along the square, rectangle, triangle and other polygons and the edge of the circle without sliding to scroll a week, the center of the circle traveled and the area swept by the calculation method. Difficult to teach】 【understanding point into line, moving into a surface. [Teaching preparation] whiteboard courseware. Teaching process First, the video material “roll hoops ” Introduction division: Please see a video. (Hoop hoop) (while listening to ask: this is doing) teacher: in this hoop game, what is changing and what has not changed (to produce courseware, presentation of the location of the circle is changing, the center of the circle to the point of contact The distance has not changed. And produce the subject - the circumference and area of the circle in exercise)