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<AOD =180°
<EOD = 45°
<AOC,AOF,FOD,COD =90°
<BOE = 180°
DITANYA:
<FOE
<AOB
<BOC
<BOD
DIJAWAB
MENCARI <FOE
= FOD - EOD
= 90° - 42°
= 48°
besar <FOE = 48°
MENCARI<AOB
= BOE - AOF - FOE
=180° - 90° - 48°
=42°
<AOB = 42°
MENCARI <BOC
= AOC - AOB
= 90° - 42°
= 48°
MENCARI <BOD
= COD + BOC
= 90° + 48°
=138°