Find !he area of the shaded region of the diagram, where ACDF is a rectangle, AC = 90 cm, AF = CD = 20 an and ED = 10 cm.

A

1000 $$cm^{2}$$

B

1400 $$cm^{2}$$

C

1200 $$cm^{2}$$

D

1100 $$cm^{2}$$