圆既是轴对称图形,又是中心对称图形,还具有旋转不变性.圆的这些特性决定了有关圆的某些问题会出现多解,有些同学由于审题不严,思考不周全,往往会造成漏解.现将圆中常见的多解问题归纳如下,供同学们参考.例1已知点P到⊙O上的点的最大距离是 Circle is both axisymmetric graphics, but also the center of the symmetrical graphics, but also has the rotation invariance of these characteristics of the circle determines some problems about the circle there will be multiple solutions, some students due to lax trial, thinking is not thorough, often resulting in leakage Solution Now the common problem of multiple solutions in the circle are summarized as follows for the students to refer to Example 1 The maximum distance between points P and ⊙O is known