Suma umghiurilor intr-un triungi este 180.
a+b+c=180
a=b+25
c=2b-9
Refacem ecuatia initiala:
b+25 + b + 2*b-9 = 180 ⇒4*b+16=180 ⇒4*b=180 -16⇒
⇒4*b=164 ⇒b=164/4=41
Introducem in ecuatiile de mai sus si aflam celelalte 2 unghiuri:
b = 41
a = 41+25 = 66
c = 2*41-9 = 73