(180-(90-40))÷2=65
∵∠DBF=90° ∠1=40°
∴∠DOB=∠DBF-∠1=90°-40°=50°
∴∠AOD=180°-∠DOB=180°-50°=130°
∵OE平分∠AOD
∴∠2=∠AOD÷2=130°÷2=65°