The description of mathematical angle in primary school photos is as follows: the angle symbol can be written in English letters, and the angle consists of two * * * point rays, the letter of the point on one ray-the vertex-the letter on the other side. The angle has nothing to do with the length of two rays, but with (included angle). Angle is a mathematical concept, which describes the size of angle, that is, the amount that must be rotated when any one of two intersecting lines overlaps with another intersecting line.