五年级数学上册知识点
五年级下册数学知识点轴对称 1.轴对称的意义:把一个图形沿着某一条直线对折,如果它能够与另一个图形完全重合,那么就说这两个图形成轴对称;这条直线就是对称轴。两个图形完全重合时的点叫做对应点;互相重合的角叫做对应角,互相重合的线段叫做对应线段。2.轴对称的性质:对应点到对称轴的距离相等。3.轴对称的特征:沿对称轴对折,对应点、对应线段、对应角重合。 旋转 1.旋转的意义:物体绕着某一点运动,这种运动叫做旋转。2.图形旋转方向:钟表中指针的运动方向成为顺时针旋转;反之,称逆时针旋转。3.图形旋转的性质:图形绕着某一点旋转一定的度数,图形中的对应点、对应线段都旋转相应的度数,相对应的点到旋转点的距离...
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