2018年秋九年级数学上册第24章圆24.3正多边形和圆(预习)课件(新版)新人教版.ppt

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第二十四章 圆,第二十四章 圆,24.3 正多边形和圆形,24.3 正多边形和圆形,探究新知,活动1 知识准备,1等边三角形的三条边_,三个内角_,都是_.,2正方形的四条边_,四个内角_,都是_.,60,相等,相等,90,相等,相等,24.3 正多边形和圆形,活动2 教材导学,1.正多边形与圆的位置关系,正多边形与圆到底有什么样的关系呢?以正五边形为例,你能证明吗?,24.3 正多边形和圆形,BCDE,ABBCCDDEEA,AB,24.3 正多边形和圆形,2.正多边形的有关计算,等腰直角,2BD,

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