从圆中基本的知识点出发,构造辅助圆来解决问题,成为中考数学命题中的一个亮点.它应用的知识点相对比较简单,但将它放置在运动的背景下,就显得对能力的要求比较高,需要我们深层理解基础知识,才能较好地解决问题.现采撷部分中考试题进行分析,以期抛砖引玉.一、借助辅助圆构造特殊角这类试题的主要特点是在平面中构造特殊角.利用在圆中,同弧所对的圆周角是圆心 Starting from the basic knowledge point in the circle, constructing the auxiliary circle to solve the problem becomes a bright spot in the mathematics proposition of the senior high school entrance exam.Its application of knowledge point is relatively simple, but placing it in the context of exercise appears to the requirement of ability Higher, we need to understand the underlying knowledge in order to better solve the problem now pick some of the test questions in the analysis, with a view to throwing bricks and stones First, with the help of the circle to create a special angle The main features of such questions is to construct a special angle in the plane. Use in the circle, with the arc of the circle is the center of the circle