( 2J1 ) 
Another ‘DETERMIRATION. 
Draw the Diameter GO and the Tangent OP, 
meeting G F produced in Q_: then the Angle under 
I F G is equal to the Angle under O G F, the Angle 
under F I L equal to that under G O Q^, both being 
right, and F I is equal to G O ; whence the Triangles 
G O Qj, F I L are fimilar and equal ; fo that G is 
equal to F L, and the Point F in an Hyperbola paffing 
through G, whofe Afymptotes are A C and O P 
« Apoll. Conic. 1, z, pi'op. 8. 
p R o p o- 
