三年级数学下册二《图形的运动》平移和旋转课堂作业北师大版.doc

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1平移和旋转备选例题(1)图向( )平移了( )格。(2)图向( )平移了( )格。解析 方向和距离是描述平移变化的两个要素。描述图形的平移变化,首先要说清楚平移的方向,接着要准确说出平移的距离(在方格纸上是指平移的格数) 。在图形平移的过程中每个点平移的距离都是相等的。因此,在确定图形平移的格数时,只要观察图形上某一点在平移时移动了几格就可以了。答案 (l)左 7 (2)右 7备选习题1在括号里填上合适的词。 (平移、旋转)火车在铁轨上行驶( )汽车的方向盘转动( )电梯的运动( )钟摆的运动( )风扇叶片的运动( )在算盘上拨算珠( )1 在方格里画出向右平移 8 格、向上平移 2 格后的图形。答案1 平移 旋转 平移 旋转 旋转 平移2

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