p 三种圆锥曲线： r= 1+ecose (1)椭圆 在B点，=a-c=a(1-e),0=0.即p=a(1-e2),e<1: (2)抛物线在B点，r=q,日=0.即p=24,e=1. (3)双曲线在B点，=a-c=a(e-1),C-0.即p=a(e2-1),e>1
三种圆锥曲线: (1) 椭圆 在B点, r= a-c = a(1-e), = 0. 即p=a(1-e 2 ), e<1. (2) 抛物线 在B点, r = q, = 0. 即p=2q, e=1. (3) 双曲线 在B点, r=a-c=a(e-1), =0. 即p=a(e 2 -1), e>1. F B x y B’ F’ C F B y x F B x y F’ 1 e cos p r 1 e cos p r
n351 In(68)=clear ["Global"]; clear["Global"]; p=1;e=0.5 p=1;e-0; Polarplot[p/(1+e*Cos[t]),(t,0,2 Pi)] PolarPlot[p/(1+e*Cos[t]),(t,0,2 Pi)] clear["Global"]; clear["Global'"]; T.0 10 0.5 70月 0.5 .20 -1.5-1.0 -0.5 05 -0.5 n39= -10-0.5 0.5 0 -L0 -0.5 Clear["Global'"]; p=1;e=1.5; PolarPlot[p/(1+e*Cos[t]),(t,0,2 Pi)] Clear["Global"]; Clear["Global"]; 2 p=1;e=1: PolarPlot[p/(1+e*Cos[t]),(t,0,2Pi)] Clear["Global'*"]; 16 -2 -350-300-250-200-150-10050=19 Nathan's works
Nathan’s works