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小学二年级数角的方法?

更新时间: 2021-06-18 06:02:29     

1、首先单个顶点的情况下,假设包括最外面的两条射线共有n条射线,则大大小小共有角的数量为:1+2+3+……+(n-2)+(n-1) 。

2、其次在多个顶点情况下,即多边形(如三角形)的情况下,只需要按照上述方法分别数出多边形每个顶点的角个数,然后将多边形各个顶点角个数相加即可得出总的角个数。

关键词: 小学 级数 方法

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