J. i-. Cum -igitur effe debeat F~Mab et F~ Ncd, 

 ponamus M~cd et N ~ab, entque 



A — cd; D — — lcd(a-hb); F ~ab c dy 



G — ahi E _=_ - 1 <x b (c -+- d). 

 Hoc modo omnes coefficientes aequationis , praeter B , fnnt 

 determinati. 





§. ^. Quaeratur nunc applicata y ex aequatioild 

 generali §. -. exhibita, prodibitque: , 



~ rEH-B-x]+y[(E-+-BJc) s — ACx* — 2CD* — C F] 



y — : ___-. _- , .Tab. I. 



unde patet nngulis abfciffis duas refpondere applicatas Hg. 2. 



" 'at y/ __. (E-fKx) + v'[lE+B.x?- \.C x^ — 2 C D x — C F 1 



V Y (E -+--'„) — V r fE— f- B X]- — A C „2 — 2C D „ — C F } ■' 



■ - v> 



ita ut fit' chorda 



V V 7 - 2 Vf (E-+-B x ]* — _AC x* ' — 2 C D x — CF]' 



1 * — ~ jS "' 



quae fi ducatur ln diftantiam eius a chorda parallela proxi- 

 ma f y ''9 puta in perpendiculum x v ~ dx iin. %, prodibit 

 elementum area.e: 



hincque area ipfa erit 



__gLfj d x Y [(E+Bxf~ACf-2CDx-CF]. 



$. 7. lam in circulo , cuius radius ~r et abfciffa 

 a centro fumta — t, elementum areae eft 2. dt]/ (r r — tt) , 

 ideoque area per totam figuram extenfa 



■nrr ~zf<ni/ (rr -tt), 

 quam aeejuationem fi ducamns in jul v fm. £ tum vero loco t 



fcri- 



