三角学的特点是建立了边与角之间的函数关系,这就为几何证题拓宽了渠道.因此,某些几何题用三角法解、证,可化难为易,简捷明晰.兹分类试析如下,供参考.一、直接应用正切函数当图形中有 Rt△时,可考虑应用正切函数. Trigonometry is characterized by the establishment of a functional relationship between edges and corners, which broadens the channels for geometrical testimony. Therefore, some geometrical problems are solved by the trigonometry method, which can be difficult to understand, simple and clear. Analyze as follows, for reference. First, the direct application of tangent function When the graph has Rt △, consider the application of tangent function.