a) A/1 = B/2 = C/3 = 180/6 = 30
mas<Aint. = 30grade⇒ mas <Aext = 150grade
mas<Bint. = 2·30 = 60 ⇒ mas <Bext. = 120 grade
mas<Cint = 3·30 = 90 ⇒ mas<Cext = 90grade
b) A/(5/6) = B/(1/4) = C/(1/6) = 180 / (15/12) = 180·4/5 = 144
mas<Aint = 5/6 ·144 = 120 ⇒ mas<Aext = 60grade
mas<Bint = 36 grade ⇒ mas<Bext. = 144grade
mas<Cint = 24 grade ⇒ mas<Cext = 156 grade