fpide!? reperlentnr lii peripheria circull centro radlo o a de« 

 fcripti. Dcinde vero omnia punda, vbi radius ofculi fit maxi- 

 jnu^, quod eucnit fi fuerit 2a4)r:(2/-(-i)7r, ideoque cof. 2 aC|) 

 r-i , a pundo rcmota erunt interuallo s - -^;^, quod prae- 

 ccdens interuallum a fuperat quantitate -—-^ •, quare omntjt 

 ifl:a pundra icperientur in peripheria circuli centro defcripti , 

 cuius radius eft ~ — :zi -2-i- -\~ -z-; • 



§. 58. Vocemus nunc angulum cojzzzvpzzzojy 

 eritque 



tano" vL* "^— ( I — ct )/m. (i-t-o[l(}) — (r-Hf^l Hn. ( t — tt Kj) 



"' ^ ^ ( I — a i coj. i I -f- a ) Cp — ( I -(- a \ coj. \ i — a 7$ ' 



quae expreiTio, euoluendo angulos (i-f-a)cp et (i — a)$>, 

 transformatur in hanc: 



rnno- vL/ « /m. (J? cor. g (I) — car. <$ rm. g (I) « fgng. (^ — fgng. « (P 



' ''' "^ a coj. $ co/. a Cp -(-jm. Cpjifi. a l|> a -)- ra"g. $ (ang. a cp ' 



Vnde loca finguliu-um cufpidum haud difficulter detegentur. 



§. 5p. Ad iianc formulam magis euoluendam intro- 

 ducamus angulum ^, vt fit tang. ~ ^ tang. a Cp, eritque 



tang. vl> = ^°"g-^-i^--i. ~ tang. (Cp — ^ , 



ita vt fit angulus o j ^ — Cp - ^. Quonium igitur angulus .yjt 

 efl 90° - 0, hinc fiet angulus s r zzz. 90° — ^, confequenter 

 anguius cjO — t>, qui ergo angulus euanefcit, fi fuerit vel 

 C)) ~ o, vel Cj) ~ -7, contra vero reda j" ad curuam erit nor- 



malis, fiue O-po", quoties fiierit aCp—^, vel '^^ vel — . 



§. 60. Demittamus nunc cx in radium ofculi per- 

 pcndiculum op, et pofito breuitatis gratia ojms, ob angu- 

 lum osp~zz^o° — Q fiet op-~ZQoi^.^ ct sp—ziin,^. lam cen- 



tro 



