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引言中学数学教学大綱(修訂草案)中規定:在高中一年級几何課程中給出10小时来学銳角三角函数.在大綱的分科說明中这样指示: “关于三角函数与解直角三角形的初步知識,是在高中一年級几何課程中教到相似形时提出来的.因此学生一学到各种相似形时,就会在解决实际問題中立刻得到应用並且获得解几何習題的新方法.”
The introduction of the secondary school mathematics syllabus (revision draft) stipulates: In the first year of high school geometry class gives 10 hours to learn the acute angle trigonometric function. In the outline of the subsection instructions: "About the trigonometric function and solving the initial knowledge of the right triangle, It was proposed when similar shapes were taught in the first grade high school geometry course. Therefore, as soon as students learn a variety of similar shapes, they will immediately apply them in solving practical problems and acquire new ways of solving geometric problems.”