同学们在初步认识角时,应注意下面两点:第一,角的大小与它两边的长度没有关系。刚刚认识角时,有人会问:是不是角的两边越长这个角就越大?比如下面三个角,它们的两条边是不一样长的,从样子看一个比一个大,那么,它们是不是一样大的角呢?同学们可以用三角板上的一个角来量一量,如果每个角的两边都与三角板上同一个角的两边重合(或用量角器来量,如果图中三个角的度数相同),那就说明这三个角是一样大的。通过动手量角,我们发现,上图这三 Students should pay attention to the following two points when they first understand the angle: First, the size of the corner has no relation with the length of the two sides of the corner. Just know the angle, some people will ask: is not the longer the two sides of the corner the greater the angle? For example, the following three corners, the two sides are not as long as they are, as they look bigger than one, then they Is not the same big angle? Students can use a corner of the triangle to measure the amount, if the two sides of each corner of the triangle with the same corner on both sides of the overlap (or the amount of protractor, if the figure three The same degree of angle), it shows that these three corners are the same size. Through hands-on measurement, we found that these three on the map