《任意角》一课是《普通高中课程标准实验教科书·数学4》(人教版)第一章任意角第一节的第一课时。是对初中所学角的概念的推广,是一节概念课。按过去一般的教法,往往是老师将所有的概念直接呈现出来,让学生记住,并不关注这一概念的形成课在学生学习三角函数这一章中的重要作用,常常是很快一带而过。事实上,过去讲这节课,我也是直接拿出任意角的概念,再给出象限角、轴线角、终边相同角等概念,让学生记住这些概念,再讲例 “Arbitrary angle” lesson is “the ordinary high school curriculum standard experimental textbook mathematics 4” (PEP) the first chapter of arbitrary angle in the first quarter. Is the promotion of the concept of junior high school angle, is a concept class. According to the past general teaching methods, teachers often present all the concepts directly and let the students remember that they are not concerned with the formation of this concept. The important role of the class in learning trigonometry is often very quickly And before. In fact, in the past, I also took the concept of an arbitrary angle directly from the lesson. I also gave concepts like quadrant angle, axis angle and the same angle at the end so that students could remember these concepts and then talk about the concept