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<AOD = 2 × 20
<AOD = 40°
Karena <BOC bertolak belakang dengan <AOD, maka <BOC = <AOD
<BOC = 40°
b) <AOC = 180- <AOD
<AOC = 180-40
<AOC = 140°
c) <BOD bertolak belakang dengan <AOC, maka <BOD = <AOC
<BOD = 140°