锐角三角函数是初中数学“空间与图形”中的重要组成部分,而解直角三角形是锐角三角函数中的重要内容.解直角三角形时求解未知量的先后顺序,以及三角函数的不同选择,都会对运算过程的繁简、以及运算结果的精确程度有直接影响.本文将以教材中一道习题为例,谈谈解直角三角形时应遵循的原则及策略. An acute trigonometric function is an important part of the junior high school mathematics “space and graph ”, while solving a right triangle is an important part of acute trigonometric function.When solving a right triangle, the order of solving unknowns and the different choices of trigonometric functions, Will have a direct impact on the complexity of the calculation process and the accuracy of the calculation results.This paper will take an exercise in the textbook as an example to discuss the principles and strategies to be followed when discussing right-angled triangle.