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直径是过圆心的一条特殊的弦.对于与圆有关的一些题目,若能根据图形的特点,巧妙地构造出圆的直径这条辅助线,便于运用有关定理或规律,从而获得解题的途径.
The diameter is a special string that is over the center of the circle. For some topics related to the circle, if it can be based on the characteristics of the figure, the auxiliary line of the diameter of the circle can be skillfully constructed to facilitate the use of relevant theorems or laws to obtain a solution to the problem. .