->S^.I ) 101 ( 



§. 41. Si in triangulo Sphaerico ABE latus AB 

 per a exprimatui-, erit ex cognitis pioprietatibus trian. 

 gulor. Sphaericorum: 



hincque 



jT^A-jIO 2C01., a j,n.Aj,n.B, — ^ ''"• ^ " » 



fiuc ob cof. E ~ 2 cof. ; E' — I ; 



cof. (A - B) = I - 2 fm. ^ (A - Bj' ; 

 cof. (A 4- B) = 2 cof. I (A H- B)^ - I , 



erit 



cof. l ar n: 



cof \ E' - fln. ! (A - B? , 



fin.4 a* =: — 



fm. A fin. B ' 



_ _ cof. \ E' - c of. \ (A H- B)^ H- - i . 

 fin. A fiii. B 



At fiipra artic. 29 demonfiraiiimus effe 



Q(cof lE^-fin.i(AH-B)') 



-^cofAcof^B^^^^^-^^+^-^+^^^^^-^^+^-^-^^^t 

 Q(cof. ^E^-fin. ^(A-B)') 



* ^cof.^(A~B+C-D)cof5(x\-B-C-fD)y 

 Hincque patet effe 



(cof-;Acof^,R + cof^CcofiD)fin.iAfin.'Bcofi«' 

 _ Ccof. ■ ( A - B 4- C + D) cof ,■ ,B -I- C + D - A) ? 

 — ^cof.i(A-B + C~D)cof-:(A-B-C4-D) S ^^ 



N 3 (cof. 



