“直线与圆”同步讲解与测试

• 作 者: 严碧友
• 出 处: 新高考.语文数学英语
• 发表日期: 2006年12期
• 关键词: 标准方程 考试要求 距离公式 两点式 点斜式 平分线 轨迹方程 坐标平面 弦长 二次函数

一、考点讲析考试要求:理解直线的斜率的概念,掌握过两点的直线的斜率公式,掌握直线方程的点斜式、两点式、一般式,并能根据条件熟练求出直线的方程.掌握两条直线平行与垂直的性质,两条直线所成的角和点到直线的距离公式,能够根据直线的方程判断两条直线的位置关系.掌握圆的标准方程和一般方程,理解圆的参数方程,掌握直线和圆的位置关系.

First, the test center to explain the examination requirements: to understand the concept of the slope of the straight line, grasp the slope formula of the two points of the straight line, to master the point equation of the linear equation, two-point type, general type, and can be based on the conditions of the familiar linear equation Grasp the nature of two straight lines and vertical lines, the angle formed by the two lines and the distance from the point to the line, can determine the positional relationship between two lines based on the equation of the line. Master the circle of standard equations and general equations, understand the circle The parametric equations grasp the positional relationship between lines and circles.