8^ Atti 



Aliud inlri potefl: examen, ponendo e —go"^ h = 

 60", qua in hypothefi palam cft , Trianguli dati aream 

 aquari parti fèxtcE ruperficiei haEmifphericaz . Idiprum ve- 

 ro eruitur ex formula noftra : eft enim fin. b= l^~^ fin.e = 

 I , cof. e = , K ( fin. ff" — fin. /j^) = —, fin. -6 (i _ cof.e) . 



^|/(fin..^-C0r./.^)=-/3, ,,,,_fi,,,^,_,,,,^ = 

 T ^ ., r • A fin./j(i— cof.^)(^('fin.e^— fin./&0 



■-^ = K3.IsiturArc.tang. fin...-iin./.^(x-cof.o "^ 



4 

 Are. tang. K3 = tfo" = redangulo ex triente femipe- 



riphaeriaj in radium = — circuii maximi -^fiiperficiei hf- 



raifphsrics . 



PROBLEMA II. 



Trianguli SpòiCvici cujufcmnque B ^ F aream invsn'irc . 



F^"^' TT ^^'^'^ omnia uti prius, dicaturque propterea q angu- 

 ■*■ lus conftans F . Erit ut antea Pp ~ _£BnSi_ . Et 



■^ fin. e 



quia finus angulorum funt uti finus laterum oppofito- 

 rum , erit fin. ^ : fin. ^ : : fin. q : fin. e , leu fin. ^ = 



^Hf^icof. ^= -i-/Cfin.e^ -fin.// fin.^^ ) , & 



fin. e ' lin.e *^ 



. fin.^ fin./-» fin. (/ c^^ r> ^ 



^^"§- -^ = ^i = 7^n-:7»-fin:/;>ih^ . Eigo p /. _ 



/^ fin_:Ìfi!M ac proinde fluxio triang. 5 ^ F = 



