Exemple. — On donne

a = 701™, 224, ^^ = 438", 265, c = 6i3«,57i, et l'on demande de calculer les angles A, B, C et /a surface s.

TYPE DU CALCUL

Calcul de r angle A.

tangiA= i/i^

log{/? — c) 2,4198881

— log/? 3,0572332

log tang^A 1,9375306

iA = 4o°53'36'',22 A=8r47'^a',44

logiP 2,9427668

^Oëip-a) 2,2437968

^og(p-b) 2,6417368

log(;7-c) 2,4198881

Calcul de Van^le B.

iB=^!

tangi^

iog(iP-«) 2,2437968

log(/?— c) 2,4198881

logtangiB 7,5395906

iB:=i90 6'23",77 B = 38°i2'47",54