coi. a _ ^^ (Tq-TTc r-+rri » 



fiue etiam 



/- <j — g-t-P-t-7-f--t «-t-(i3-»-Y'y- Htt(?-4-«7H-P7 — «3 7 

 COl. O — (>-+-aH'-*-iJH«-i-7i 



§. i8. Exemplum prlmum. Sint duo latcra ^ et c 

 quadrantes, ideoque (3 — o et y n: o, quo ergo cafu pro- 

 dibit cof. S =:: ^r:^' — a — col. « i confequeater erit ite- 

 rum vt fupra S — a. 



§. 19. Exemplum fecundum. Slt triangulum fphae- 

 ricum recflangulum , exiftente angulo A redlo, eritque, vti 

 fupra vidimus, cof. ^^ =z cof. ^ cof <:, liue a^py, quo va- 

 lore fubftituto reperitur: 



^^C C p-i-'V-4- »P7 ->-|3P-t-' Y7-<-337->-PYV /:„• 



COl. a — (,_HpH'^f^)(«-»-iVJ > ".uc 



f <j p4.v (.-t-0 -HV-f-PV) P + V 



COi. o — (T4:^K'-*-'Y;(«+i57> — «-t-(3V * 



Fro eodem vero cafu fupra inuenimus S — ^^'^f^ ^ ^y"'^'^^ 

 quod egregie congruit, cum hinc fiat 



fin. S' + cof. S^ 1= "-^1^^^^ = I. 



f. 20. Exemplum tertium. Sit triangulum aequi- 

 latcrum, fme arzpzry, eritque cof. S — ii^*;^-^^. 

 Supra autcm inuenimus pro hoc cafu 



/;« C fj-j-Ta)(j_--a)>> ( ■->-««) . 



ad quarum expreffionum confenfum oftendendum fuma* 

 xnus vtriusque formulae quadratum, ac prodibit: 



COl. J> _- li--^oPi ^ . 



r Ct _('+«a + s.aa)('-ja«+tai)— .+«0+15.?^-^*^:^-^——; 



iin. d — j7 +^7 ' — ~ 1 • +« i* ' 



^ua* 



