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Moderate

Trapezoid Area from a Line Segment

ACTMAT-HY4GEK

The height of trapezoid ABCD below is 8 cm.

$ { \overline { EF } } $ is parallel to $ {\overline { AB } } $ and $ {\overline { DC } } $, and intersects $ {\overline { AD } } $ and $ {\overline { BC } } $ at the midpoints of $ {\overline { AD } } $ and
$ {\overline { BC } } $, respectively.

If $EF = 10$ cm, what is the area, in square cm, of trapezoid ABCD?

A

$20$

B

$40$

C

$60$

D

$80$

E

$100$