几何计算题,是在给定的已知条件下,求某些线段的长度、角的度数、两条线段的比值、图形的面积等等,它的基本问题是求线段的长度和角的大小,怎样利用方程思想去解答几何计算呢?我们一般先设要求的线段的长度或角的度数为未知数,设法把其他有关的量用含未知数的代数式表示,然后把它们代入到等量关系中,建立一个代数方程式方程组,最后通过解方程或方程组得到所要求的结果。 The geometric calculation problem is to find the length of some segments, the degree of the angle, the ratio of two segments, the area of ​​the graph, etc., given the known conditions. The basic problem is to find the length of the segment and the size of the angle. How do we use equations to solve geometric calculations? We generally set the length of the required line segment or the degree of the angle as an unknown number, try to represent other related quantities in algebraic expressions with unknowns, and then substitute them into the isometric relationship. Create an algebraic equations equation group and finally obtain the required result by solving equations or equations.