2019年春七年级数学下册第6章数据与统计图表6.3扇形统计图课件新版浙教版20190119248.pptx

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1、第6章 数据与统计图表,6.3 扇形统计图,学知识,筑方法,勤反思,知识点一 扇形统计图,6.3 扇形统计图,学知识,圆,扇形,6.3 扇形统计图,40,20,6.3 扇形统计图,知识点二 圆心角度数,360,6.3 扇形统计图,6.3 扇形统计图,144,6.3 扇形统计图,类型一 学会正确制作扇形统计图,筑方法,6.3 扇形统计图,6.3 扇形统计图,【归纳总结】绘制扇形统计图的一般步骤 (1)根据有关数据先算出各个部分在总体中所占的百分比,再算出各个部分所对应扇形的圆心角的度数; (2)取适当的半径画一个圆; (3)根据算得的各扇形圆心角的度数,用量角器在圆内画出各个扇形; (4)在各个

2、扇形内写上相应的名称及百分比,用不同的标志把各个扇形区分开,并写出统计图的名称等,6.3 扇形统计图,类型二 尝试在统计图表中获取信息并处理相关问题,6.3 扇形统计图,6.3 扇形统计图,6.3 扇形统计图,【归纳总结】学会读图 条形统计图和扇形统计图相结合是常见的考查形式,读懂统计图,从不同的统计图中得到必要的信息是解决问题的关键条形统计图能清楚地表示出每个项目的具体数据;扇形统计图直接反映各部分占总体的百分比大小,6.3 扇形统计图,小结,勤反思,扇形统计图,能直观生动地反映各部分在总体中所占的比例,6.3 扇形统计图,定义,特点,绘制步骤,计算圆心角的度数,画圆,写名称等,量角度画扇形,反思,6.3 扇形统计图,6.3 扇形统计图,

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