∵∠BOC:∠AOD=3:5.
则设∠BOC=3x ∠AOD=5x
OA⊥OB,OC⊥OD ∠AOB=∠COD=90°
∴∠BOC+∠AOD+∠AOB+∠COD
=3x+5x+90°+90°=360°
8X=180°
X=45°/2
∠BOC=3X=135°/2=67.5°
∵∠BOC:∠AOD=3:5.
则设∠BOC=3x ∠AOD=5x
OA⊥OB,OC⊥OD ∠AOB=∠COD=90°
∴∠BOC+∠AOD+∠AOB+∠COD
=3x+5x+90°+90°=360°
8X=180°
X=45°/2
∠BOC=3X=135°/2=67.5°