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In the given figure, A B C D is a ...

In the given figure, `A B C D` is a rectangle with `A D=4` units and `A E=E BdotE F` is perpendicular to `D B` and is half of `D F` . If the area of the triangle `D E F` is 5 sq. units, then what is the area of `A B C D` ? `18sqrt(3)` sq. units (b) 20 sq. units (c) 24 sq. units (d) 28 sq. units

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