DOB=45°=>DOE=22.5°
DOA=180°-45°=135°
COD=135°:2=67.5°
COE=COD+DOE=67.5+22.5=90°
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DOB=45°=>DOE=22.5°
DOA=180°-45°=135°
COD=135°:2=67.5°
COE=COD+DOE=67.5+22.5=90°