OA垂直于OB,OC垂直于OD,OE是OD的翻身向延长线。试说明:角AOC=角BOD?
若角BOD=50度,求角AOE?
证明:∵∠AOC+∠BOC=90° ∠BOD+∠BOC=90°
∴∠AOC=∠BOD
∵∠AOE+∠AOC=90° ∠BOD=50°
∴∠AOE=40°