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怎样数角和线段
更新时间: 2020-11-05 00:00:00  

1、数线段:一条线段上有若干个点,要数共有多少条线段,可先数出以左边第一点为端点,其余点为另一端点的线段的条数,然后再数出以左边第二个点为端点,其余点(第一个点除外)为另一个端点的线段条数,以此类推,直到数出最后一条线段为止,把这些条数相加即可。

2、数角:不同的角的个数是:n×(n-1)÷2即一共可以组成n×(n-1)÷2个角。

关键词: 怎样 线段

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