In the figure above, if the area of triangular region D

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A

B

C

D

E

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In the figure above, if the area of triangular region D is 4, what is the length of a side of square region A?

(1) The area of square region B is 9.
(2) The area of square region C is 64/9.

[spoiler]OA=D[/spoiler]

Source: Official Guide