Răspuns :
a + b = 180
a = 3b
3b + b = 180
4b = 180
b = 180 : 4
b = 45 q ciment
a = 180 - 45
a = 135 q ciment
a = 3b
3b + b = 180
4b = 180
b = 180 : 4
b = 45 q ciment
a = 180 - 45
a = 135 q ciment