

/'*\> 



the Mtuntlanl equation of this hyperboU BfWJ ; 1 1- 



hi can be reduced to tin* form, a* U 



>liu\\n i: ' \ 1 1. 



ii tin- < ml. i to tl,,. ; the hyp< 



- ^^1 in cattily found tin: 



CF-CO + 



a equation (8), 



. . c-n 



th. i. i,,r,- thefocut Fit the point 



: tin- ilinvt : 



0). 



the directrix 



* = 0. 



a above deli real, and iu value is known when a 



* are "known. In \-"\^. 86, 



= A, and 



a 



117. To trace the hyperbola 5-5" 



t : ^ * 



Equatiun [47] 



i 1 The hyperbola is symmetrical with regard to the 

 ; that i>, with respect to the lino through the focus 

 perpendicular to the directrix. This 1 iierefore 



the principal axis of the hyjterbola; 

 The hyperbola is symmetrical with regard to the 

 also; i.e.. with regard to the line parallel to the di- 

 and passing through the mid-point of the 

 l.y the BO i it- jirineipal a\ 



-18 



