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圆在平面几何中,占有着重要的地位,同时,圆的性质在平面解析几何中也有着广泛而灵活的应用,运用好圆的性质,不仅使我们免去解析几何中复杂而冗长的运算,还能充分地感受到平面几何的魅力．
The circle plays an important role in the plane geometry. At the same time, the nature of the circle also has a wide range of flexible applications in the plane analytic geometry. The use of a good circle not only frees us from the complex and lengthy operations of analytical geometry. Can fully feel the charm of plane geometry.