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BOD&AOC=180°-(BDO+OBD)
BOD&AOC=180°-(20°+20°)
BOD&AOC=180°-40°
BOD&AOC=140°
BOC=[360°-(BOD+AOC)]:2
BOC=[360°-(140°+140°)]:2
BOC=[360°-280°]:2
BOC=80°:2
BOC=40°
Maaf, kalau salah. Hehehe.......