在《圆周角》的教学中应注意四点:一是圆周角概念的教学应注意简明性;二是要明确圆周角与圆心的位置关系仅有三类;三是在发现圆周角与圆心角的关系中,应注意方法的多样性与优选性;四是要让学生有所了解证明圆周角应分类的理由. The teaching of “circumference angle” should pay attention to four points: First, the concept of circumference angle should pay attention to the teaching of conciseness; the second is to clarify the location of the circumference angle and the center of the circle there are only three categories; third is found in the circumferential angle and the central angle Relationship should pay attention to the diversity of methods and preferences; Fourth, let students have some understanding of the reasons that the circumference angle should be classified.