近年各地中考中的几何计算问题,融几何推理与代数运算于一体,赋予了几何图形丰富的动态背景(或点、线、面的运动元素,或图形的变换),融进了几何核心知识(全等、相似、锐角三角函数、勾股定理等).而相似图形中边与边的比例关系式,锐角三角函数中边与角的关系表达式,面积与边的关系表达式,勾股定理中边与边之间的关系式,以及几何 In recent years, the geometric calculation problems in the middle school entrance examinations have merged geometric inference and algebraic operations into one, giving the rich dynamic background of geometry (or the movement elements of points, lines and planes or the transformation of graphics) into the geometric core knowledge Congruent, similar, acute trigonometry, Pythagorean theorem, etc.) The relation between edge and edge in similar graphs, the relationship between edges and corners in acute trigonometric functions, the relation between area and edge, Pythagorean theorem The relationship between the sides and the edges, as well as the geometry