GEOMETRY 



2.423 OF = OF' = ea. 



e = eccentricity 



Va 2 + b 2 



49 



FIG. 5 



b 2 



FL = = a(e 2 i) = semi latus rectum. 



F'P = ex + a, FP = ex- a, F'P - FP = 2a. 

 r = angle XTP. 

 bx 



tan r = 



a 



NM = ?, ON = e 2 x, OT = -> OT' = -> 



a x y 



/^)C 



\/e 2 * 2 - a 2 ~ Ve 2 x 2 - a- 



2.424 



OU = Asymptote. 



tan XOU = - 

 a 



b * distance of vertex A from asymptote. 



