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b) COD = 180 - DOF (berpelurus)
COD = 180-70= 110
c) AOF = COD = 110 (bertolak belakang)
d) AEC = 1/2 (AOC) = 35 ( sdt keliling =1/2 sudut pusat)
e. DBF = 1/2 (DOF) = 35 (sudt keliling = 1/2 sudut pusat)