在平面解析几何中，判断直线与圆的位置关系主要有两种方法：方法卫是从代数角度，即从直线方程与圆方程联立所得的方程组的解的个数来判断；方法2是从几何角度，即从圆心到直线的距离与半径的大小关系来判断．在解题中，常用方法2．对直线与椭圆位置关系的判断，目前只有一种 In plane analytic geometry, there are mainly two methods for judging the positional relationship between a straight line and a circle: Method Wei is judged from the algebraic angle, that is, from the number of solutions of a system of equations obtained by the combination of a linear equation and a circular equation; Method 2 is From the geometric angle, that is, from the center of the circle to the distance and radius of the size of the relationship to judge. In the problem solving, the common method 2. There is currently only one kind of judgment on the positional relationship between a straight line and an ellipse