分类
高中

极坐标方程的定义

A polar coordinate system, gives the co-ordinates of a point with reference to a point 0 and a half line or ray starting at the point O. We will look at polar coordinates for points in the xy-plane, using the origin (0, 0) and the positive x-axis for reference. A point P in the plane, has polar coordinates (r, 6), where r is the distance of the point from the origin and θ is the angle that the ray |OP| makes with the positive x-axis.

极坐标1.pptx

极坐标下方程的图像
The graph of an equation in polar coordinates r= f(θ) or F(r,θ)= 0 consists of all points P that have at least one polar representation (r, 0) whose coordinates satisfy the equation.

极坐标2.pptx

分类
高中

曲线的极坐标方程

如图L1-3-1.在极坐标系Ox中. A(2.0),B(√2,π/4),C(√2,3π/4),
D(2,π),弧AB,BC,CD所在圆的圆心分别是(1,0),(1,π/2),(1,π),曲线M1,是弧AB,曲线M2是弧BC,曲线M3是弧CD.
(1)分别写出M1,M2,M3的极坐标方程;
(2)曲线M由M1,M2,M3构成,若点P在M上,且|OP|=√3,求P的极坐标.

book38-10-14-answer22.pptx

在平面直角坐标系xOy中,以原点O为极点,x轴的正半轴为极轴建立极坐标系.已知曲线C的极坐标方程为给ρ2=16/(1十3 sin2θ),P为曲线C上的动点,C与x轴、y轴的正半轴分别交于A,B两点.
(1)求线段OP的中点Q的轨迹的参数方程;
(2)若M是(1)中点Q的轨迹上的动点,求从△MAB面积的最大值.

book38-19-10.pptx

分类
高中

标准椭圆的准线是x=a/e

详谈焦准距,要按文件顺序看。

极坐标3从椭圆定义推导方程.pptx

极坐标4椭圆的准线equation of the directrix of an ellipse.pptx

极坐标5椭圆的焦准距.pptx

分类
高中

圆锥曲线的极坐标方程

ppt选自网络,感谢作者。