三年级数学下册二《图形的运动》轴对称(一)同步练习北师大版.doc

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1轴对称(一) 填空1. 如果一个图形沿着一条直线对折,两侧的图形能够完全重合,这个图形就是( ),折痕所在的直线叫做( )。2. 圆的对称轴有( )条,半圆形的对称轴有( )条。3. 在对称图形中,对称轴两侧相对的点到对称轴的( )。4. ( )三角形有三条对称轴,( )三角形有一条对称轴。5. 正方形有( )条对称轴,长方形有( )条对称轴,等腰梯形有( )条对称轴。6. 如果把一个图形沿着一条直线折过来,直线两侧部分能够完全重合,那么这个图形就叫做_,这条直线叫做_7. 对称轴_连结两个对称点之间的线段8. 宋体的汉字“王”. “中”. “田”等都是轴对称图形,请再写出三个这样的汉字:_9. 长方形有_条对称轴,正方形有_条对称轴,圆有_条对称轴10. 如图是一种常见的图案,这个图案有_条对称轴,请在图上画出对称轴11. 右图是从镜中看到的一串数字,这串数字应为 .12. 下列图形中是轴对称图形的在括号里画“”。 ( 第 8题 ) 2答案1. 轴对称图形 对称轴2. 无数 13. 距离相等4. 等边 等腰5. 4 2 1 6. 略7. 垂直于8. 天 一 二9. 2 4 无数10. 211. 81007612. 略

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