在历年的高考中圆的问题都是一个考查重点,同时也是解析几何中的一个典型问题.考查重点是圆的标准方程和圆的一般方程的求解,以及对圆的位置问题的判断;学习难点是根据题意选择适当的方法求圆的方程;选择适当的方法(代数法,几何法)研究圆的位置问题.题型一求圆的方程 The round question in the college entrance examination over the years is a test focus, but also a typical problem in analytic geometry. The key point is the solution of the standard equation of the circle and the general equation of the circle, as well as the judgment of the position of the circle; Is to select the appropriate method based on the idea of ​​finding the equation of the circle; choose the appropriate method (algebra method, geometry method) to study the location of the circle.