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参数方程与极坐标方程作为高考选考内容之一,在近几年的高考中亮点层出不穷.尤其是涉及直线与曲线相交时的距离问题,演绎得惟妙惟肖,异彩纷呈,大有一发而不可收之势.穷其解法,大都是在直角坐标系中用熟悉的普通方程来解决,过程繁且极大地抑制了学生思维的发展.若能灵活、巧妙地选择直线的参数方程或极坐标方程,利用参数的几何意义或极径的几何意义,定可事半功倍,妙求六类距离.
Parameter equation and polar equation as one of the college entrance examination selection, in recent years, the college entrance examination highlights one after another, especially when it comes to the straight line and the intersection of the curve when the distance problem, the interpretation of the vivid, colorful, great hair out of reach Potentially poor solution, mostly in the Cartesian coordinate system with a familiar ordinary equation to solve, the process of complex and greatly inhibit the development of student thinking.If the flexible and cleverly choose a straight line parametric equation or polar equation, the use of The geometric meaning of the parameters or the geometric meaning of the polar radius, will be able to do more with less, wonderful and seek six types of distance.