tolong jawab pake cara ya

3a + 2a + 35 = 180°
5a = 180 - 35
5a = 145°
a = 145 : 5
a = 29°

2b + 2b + 2b = 180°
6b = 180°
b = 180 : 6
b = 30°

3c + c + c = 180°
5c = 180°
c = 180 : 5
c = 36°