FOE:
= 180° - (90° + 42°)
= 180° - 132°
= 48°
AOB:
AOB bertolak belakang dengan EOD, maka AOB = EOD = 42°
BOC:
BOC bertolak belakang dengan FOE, maka BOC = FOE = 48°
BOD:
BOD bertolak belakang dengan jumlah total AOF + FOE, maka
BOD = AOF + FOE
BOD = 90° + 48°
BOD = 138°
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FOE:
= 180° - (90° + 42°)
= 180° - 132°
= 48°
AOB:
AOB bertolak belakang dengan EOD, maka AOB = EOD = 42°
BOC:
BOC bertolak belakang dengan FOE, maka BOC = FOE = 48°
BOD:
BOD bertolak belakang dengan jumlah total AOF + FOE, maka
BOD = AOF + FOE
BOD = 90° + 48°
BOD = 138°
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