3) 3a°+5a°+60°=180°
=> 3a°+5a°=180°-60°
=> 8a°=120°
=> a°= 15°
a. Besar sudut AOC = 3a°
= 3 x 15° = 45°
b. Besar sudut BOC = 5a°+60°
= 5 x 15°+60°
= 75°+60°= 135°
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3) 3a°+5a°+60°=180°
=> 3a°+5a°=180°-60°
=> 8a°=120°
=> a°= 15°
a. Besar sudut AOC = 3a°
= 3 x 15° = 45°
b. Besar sudut BOC = 5a°+60°
= 5 x 15°+60°
= 75°+60°= 135°