三年级数学下册第2章热闹的民俗节—对称课件青岛版六三制.ppt

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对称,这三幅图有什么共同的特点?你还能提出什么问题?,这三幅图有什么共同的特点?,的上下两边是一样的。,的左右两边是一样的。,的左右两边是一样的。,这些物体都是对称的。,合作探索,像这样对折后能够完全重合的图形是,轴对称图形。,探索:把这些图形对折会怎样呢?,合作探索,思考:用下面的方法剪出的图形是轴对称图形吗?,合作探索,生活中的对称美随处可见,你见过下面这些对称现象吗?,生物中的对称美。,合作探索,建筑中的对称美。,合作探索,1. 找一找,哪些是对称的?请在括号里画。( ) ( ) ( )( ) ( ) ( )( ) ( ) ( ),2.下列图形中,哪些是轴对称图形?是轴对称图形的,请在( )里画“ ”。( ) ( ) ( )( ) ( ) ( ),这节课我学会了什么?快来说一说吧!,课本第21页自主练习第3,4题。,xx小学 x年级x班,xxx,

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