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98. Let pm, the perpendicular to the tangent pt, cut the axis A a in Mj and 
/p, produced, cut fr in <?. 
Then will pm bifect the angle fp f. 
For p f x Mf—pfx mf. 
99, And the angle fpt is equal to the angle fpt. 
For /.TPF-f /.FPM= /.*P/+ /./PM. 
jco. Therefore pt will bifecSt the angle fp?>. 
For/.<pPT:=: ( Z./P t = ) /.fpt. 
1 0 , 1 . Confequently p® = pf. And R<pr=RF. 
102. A circumference of a circle defcribed from /, with the radius ttf, will cut 
the axis a a in the focii F, f. 
For tmxt«~tfxt/. 
A a a a 
103. A 
