因事故导致严重的外部出血时，应采取下列( )方法？

A．用布料直接包裹，制止出血

B．清洗伤口后加以包裹

C．用药棉将流出的血液吸去

The figure above represents a rectangular parking lot that is 30 meters by 40 meters and an attached semicircular driveway that has an outer radius of 20 meters and an inner radius of 10 meters. If the shaded region is not included, what is the area, in square meters, of the lot and driveway