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平面几何中有关定值问题的证题,包括定值的探求及论证。定值探求的一般思考方法是,将题设中的任意点、任意线(线段或直线),放置在特殊位置,而将任意图形化为特殊图形,然后利用图形的特殊性所产生的性质进行探求。如: 1.线段的中点或端点是线段上的点的特殊位置; 2.两条直线互相垂直或平行,是两条直
The test questions of the fixed value problem in the plane geometry include the search and demonstration of the fixed value. The general thinking method of setting search is to place arbitrary points, arbitrary lines (line segments or straight lines) in the title, in special positions, and to arbitrarily graph them as special graphics, and then use the nature of the graphics to produce the properties Exploration. For example: 1. The middle point or end point of a line segment is a special position of a point on a line segment; 2. The two straight lines are perpendicular or parallel to each other and are two straight lines.