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180 = 12x -12
12x = 180 + 12
12x = 192
x =
x = 16°
pelurus sudut AOC adalah sudut COB
∠COB =4x +8
= 4(16) + 8
= 64 + 8
= 72° (D)
Jwb:8x-20=190
<=>8x=190-20
<=>8x=170
<=>x=170/8=21°
#maafkalosalah