连接OA、OB，过O作OD⊥AB，交AB于点E，∵OD=0.6m，DE=0.3m，∴OE=OD-DE=0.6-0.3=0.3m，∴cos∠AOE=OEOA=0.30.6=12，∴∠AOE=60°∴AE=OA•sin∠AOE=0.6×32=3310，AB=2AE=335∴∠AOB=2∠AOE=2×60°=120°，∴S阴影=...