Răspuns:
fie a ; b ; c unghiurile cautate
avem 2 posibilitati
1) a = b ; c
a/2 = c/5 = k
a = b = 2k
c = 5k
a + b + c = 180
2k + 2k + 5k = 180
9k = 180
k = 20
a = b = 40°
c = 100°
2) a ; b = c
a/2 = c/5 = k
a = 2k
b = c = 5k
a + b + c = 180
2k + 5k + 5k = 180
12k = 180
k = 15
a = 30°
b = c = 75°