tolong dibantu ya no.4

(i) 2a + 3a + 25 = 180
5a = 155
a = 31°

(ii) 2b + 2b + 2b = 180
6b = 180
b = 30°

(iii) 3c + c + c = 180°
5c = 180
c = 36°

Semoga Bermanfaat! :)
Makasih:D