2年级数学上册《角的初步认识》知识点
《角的初步认识》知识点1、一个角有(1)个顶点,有(两)条边;两条边是(直直的),都从顶点出发。【练一练】标出角的各部分名称2、角的画法:先画顶点,再画边。画角时,从一个(点)起,用(尺子)向不同的方向画(两)条直直的线,就画成一个(角)。3、用三角板可以画出直角(课本40页图例)。画角时应写上角各部分的名称。(课本44页第7题以及给出顶点和一条边,把角补充完整。)4、要知道一个角是不是直角,可以用三角尺上的直角比一比。量直角的方法:顶点对顶点,一条边对一条边,看另一条边是否重合,重合就是直角,没有重合就不是直角。5、三角尺都有(1)个直角和(2)个锐角。正方形、长方形都有4个角,4个角都是直...
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