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Math·Geometry and Trigonometry·Area and volume

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Rectangles $ABCD$ and $EFGH$ are similar. The length of each side of $EFGH$ is $7$ times the length of the corresponding side of $ABCD$. The area of $ABCD$ is $84$ square units. What is the area, in square units, of $EFGH$?

A

12

B

49

C

588

D

4,116