正方形网格试题,新颖别致,同时具有直观性和可操作性的特点.近年来许多地区的中考频繁出现在正方形网格中求锐角三角函数值的问题.解决此类问题的关键是利用锐角边上的格点找到直角或构造直角三角形进行求解.当锐角所在的三角形是直角三角形时,则可根据锐角三角函数的定义直接求解;若锐角所在的三角形是非直角三角形时,往往需要作垂线、平移线段等有效策略构造直角三角形来解决. Square grid test questions, novel and unique, at the same time intuitive and operational features.In recent years in many areas of the senior high school entrance examination often appear in triangular grid trigonometric value of the problem.To solve these problems is the key to the use of acute angle When the triangle where the acute angle is is a right triangle, it can be directly solved according to the definition of the acute angle trigonometric function; if the triangle where the acute angle is located is a non-right triangle, it is often necessary to make a vertical line, Translating segments and other effective strategies to construct right-angled triangle to solve.