1)S阴影=S△ABC-S△AEF-S△EBC
=S△ABC-1/4×S△ABC-1/2×S△ABC
=24-6-12=6
或S阴影=S△AEF=1/4×S△ABC=6
2)S阴影=1/2×S平行四边形ABCD=1/2×96=48