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<cba = 180-125= 55°
<acb = 180-(70+55) = 180-125 = 55°
b) <dcb = 180-55 = 125°
Sudut CAB = 180°-110°=70°
sudut CBA = 180°-125°=55°
Sudut ACB = 180°-70°-55°=55°
B. Sudut DCB = 180°-55°=125°