近年来的中考试题中,常出现一类在直角坐标系中研究直线与圆的位置关系的新型试题.它的显著特点是数形结合,用代数方法来研究几何问题.借助坐标函数。运用几何条件解题是解决这类问题的关键,现举几例说明. In the mid-term examination questions in recent years, a new type of questions are often presented in the Cartesian coordinate system to study the positional relationship between the straight line and the circle. Its distinguishing feature is the combination of numbers and shapes, using algebraic methods to study geometric problems. With the aid of coordinate functions. The use of geometric conditions to solve problems is the key to solving this type of problem.