tolong ya kak tolong bantu.. pke cara ya ka tolong.

180° = 3a° + 5a° + 60°
180° = 8a° + 60°
8a° = 180° - 60°
8a° = 120°
a = 120° / 8
a = 15°

a. Besar sudut AOC
= 3a
= 3 x 15°
= 45°

b. Besar sudut BOC
= 5a + 60°
= 5 x 15° + 60°
=75° + 60°
= 135°

Semoga membantu :)