So ad//BC, AB//DC,

Because AB//DC,

So DE/EF=CE/EB,

Because AD//BC,

So the height of triangle CDE is equal to the height of triangle ABE,

So the area of triangle CDE/the area of triangle ABE =CE/EB, (the ratio of triangle areas with equal height is equal to the ratio of bottom).

And because the area of triangle CDE/the area of triangle CEF =DE/EF, (similarly).

So that area of triangle CEF = the area of triangle ABE =96 square centimeter,

That is, the shadow area is 96 square centimeters.