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sean a,b,c los angulos dicen
b=40+c
a=40+b
a=40+(40+c)
a=80+c
sumamos
a+b+c=180
(80+c)+(40+c)+c=180
3c+120=180
3c=60
c=20
piden mayor:
a=80+c
a=80+20
a=100