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<BAD = 130 ÷ 2
<BAD = 65°
<BCD = sudut reflek BLD ÷ 2
<BCD = ( 360 - 130 ) ÷ 2
<BCD = 230 ÷ 2
<BCD = 115°
= 65
b sudut reflek BAD= (360 - 130) = 230.
<BCD = x 230 = 155