单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,#,玩,转,数学,课堂,图形的运动二,轴对称,玩,转数学课堂,先把纸对折，然后从折痕的地方，撕下一块,。,折一折,状元成才路,状元成才路,状元成才路,状元成才路,像这样，对折后两边能够完全重合的,图形就是,轴对称图形,。,中间这条直线就是,对称轴,。,拆一拆,状元成才路,1这幅图是轴对称图形吗？,2中间的一条直线表示什么？,3点A和A在这幅图中是两个对应点，它们到对称轴的距离 。,拆一拆,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,你能补全下面这个轴对称图形吗？,想一想：,1.,先画什么？再画什么？,2.,每条线段应该画多长？,第一张,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,找到,关键点,数出或量出关键点到对称轴的距离,在对称轴的另一侧找出关键点的对称点,按照所给图形，顺次连接各点,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,试一试，画出下面这个轴对称图形的另一半。,第一步：找到关键点；,第二步：通过,数格,找到,对称点,；,第三步：顺次连线。,A,5,格,5,格,A,B,B,3,格,3,格,第二张,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,4.,你能画出下面图形的另一半吗？试一试。,1,先找到对称轴左边图形的几个关键点的对称点，再连线。,第三张,状元成才路,状元成才路,状元成才路,第四张,状元成才路,状元成才路,状元成才路,状元成才路,第五张,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,状元成才路,请你欣赏,