论文部分内容阅读
§4.1角的概念的推广重难点解读1.角可以看成是一条射线绕着它的旋转而成的,开始位置的射线叫,旋转终止时的射线称为.2.规定为正角,为
§4.1 Promotion of the concept of angles Interpretation of difficult points 1. The angle can be seen as a rotation of rays around it. The ray at the beginning is called and the rays at the end of the rotation are called. 2. The positive angle is defined as