tolong dibantu ya....

<COD = 4x + 2 =90°
4x = 90° - 2
4x = 88°
x = 88 : 4
x = 22°
<AOB = 180° - <BOC
= 180° - (x+3)°
= 180° - (22+3)°
= 180° - 25°
= 155°

Semoga jawaban saya membantu