转化是解决数学问题的一种重要的方法,初中数学的许多知识的学习都应用了转化思想。锐角的三角函数建立了三角形的边角关系,在应用中又建立起两个直角三角形的联系,转化在其中得到充分的体现。因此,在学习三角函数一章时,让学生体会转化思想,运用转化的方法解决问题,培养学生解决问题的能力。 Transformation is an important way to solve mathematical problems. Many of the junior high school maths have applied transformation thinking in their study. The trigonometric functions of acute angles establish the corner relation of triangles, and in the application, they establish the connection of two right-angled triangles, and the transformation is fully reflected in them. Therefore, when learning a chapter on trigonometry, let students understand transformation thinking, apply transformations to solve problems and develop students’ ability to solve problems.