->^.% ) S7 ( ^H<» 

 (fin. iafm.ld-h fin. \ b fin. \ c) cof.^ a cof. i d cof. ^ A' 



nec non 



._^, Jn\l[a^b+c-d)V:,{b-^c+d-a)cCi{a^b-c-d)ct\{a'b+c-d) 

 ^'* ~fin.t(d;+^-c-^)f.;{a-^+^+//}cf.;(fl+^+<;+</}cf.;(a-^-c+^)* 



cx qiiibus formiilis angulus A per tria quadrilateri latera 

 dcterminatur. Hic autem confimiles formulae pro reliqnis 

 angulis B, D, C tradi poffunt. Sic pro angulo D erit 



(fin. \afm\d-\- fin. \b fxn.\c) cof ' b cof. ; c fm. -; D' 



= £\n.\{a-{-b-c-^d) fin.;(a-^ +f+d'} co^{b-c-^a-d) coi.^{b-c-a-^d); 



(fin. \afm.kd^ fin.^ b fin. l c) cof. -; b cof. \ c cof. i D' 

 rfin.;(a+^+<r-^}fin.;(^+i-+^-tf}cof.;(a+^-f<;+^}cr^(a-^-tf+</}; 

 hinc colligitur: 



fin. ^ (A + D) = fin. \ A cof. ^ D -I- cof ^ A fin.i D 

 =: ^ (fin. i(^a -\- b -^c - a) Cm.lQ -^ c -\- d - a)) 

 H- B (fin. I (^ 4- ^ _ t- + ^) fin. \(a - b + c -^- d)) et 



cof. I (A -1- D) =r cof. i A cof.^ D - fin.i A fin.i D 



= ^(coC\{a-{-b-\-c-^d)coC\{a-b-c-{-d) 

 - ^ (cof.-; (a - Z» -I- f - r/) cof. ; (a 4- /i - ^ - </)), 



exifiente 



fjL-Vcof.; (a-\-b-^c-\-d)co{:i{a-b-c-\-d)cf.l{a-b-{-c-d) cr.l{a+b-c-d); 



V - y(cof. 5 a cof 5 ^ cof. ; c cof | </) (fin. ^ « fin 5 ^+ fin ^ ^ fin.5 1) ; 



u=yfin.-;(«+^+f-.Y}fin.;(o+^-c+</jfin.-;(^-^+r+^}f.;(Hf+</-fl) 



