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角的大小和什么有关?关于这个问题,我们可以做一个实验来探究。用一个图钉把两根硬纸条的一端钉在一起,就做成了一个活动角,如下图:移动活动角的一条边,可以形成许多不同的角,这些角的边都是一样长的:通过移动活动角我们可以发现:角的大小与角的两条边的长短无关,只与角的两条边张开的大小有关。角的两条边张开得越大,角就越大;角的两条边张开得越小,角就越
What is the size of the corner? And on this question, we can do an experiment to explore. A thumbtack fastens one end of the two strips of paper together to form a corner of activity, as shown in the following figure: Moving one side of the corner creates many different angles, all with the same length of edges: By moving the active corner, we can see that the size of the corner is independent of the length of the two sides of the corner, and is only related to the size of the two sides of the corner. The larger the two sides of the corner open, the larger the angle; the smaller the two sides of the corner open, the more the corner