师:对,旋转后的三角形 ,形状、大小都没有发生变化,只是位置变了。这就是旋转的一个性质。
3、师:在想一下,画旋转 图形时,要注意什么?
师:旋转时要注意旋转的角度和距离。可以先找一条线段旋转后的位置,在画出旋转后的图形。
三、课堂练习
1、想一想,填一填。
( 1)三角形 A绕点O按( )时针方向旋转( )的三角形B。
(2)三角形A绕点O按( )时针方向旋转( )的三 角形B。
(3)三角形A绕点O按( )时针方向旋转( )的三角形B。
2、画出图中长方形①绕点M顺时针旋转90°后的图形,再画出长方形②绕 点N逆时针旋转90°后的图形。
3、想一想,图①中的三角形绕中心点每次 旋转多少度能得到这个图案?图②中的正方形呢?
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" width="253" height="126"/> 四、课堂小结
说说本节课的收获?
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