Răspuns:
Explicație pas cu pas:
2a = 3b = 5c = k
a = k/2
b = k/3
c = k/5
a + b + c = 180°
k/2 + k/3 + k/5 = 180°
15k/30 + 10k/30 + 6k/30 = 180°
31k/30 = 180°
k = 30*180/31 = 5400/31
a = (5400/31)/2 = 2700/31
b = (5400/31)/3 = 1800/31
c = (5400/31)/5 = 1080/31