Answer
$128 \ mm^2$
Work Step by Step
Letting $e$ and $f$ be diagonals of a square.
Here, $e \times f=(8)(2) =16 \ mm$
Now, the area of a square is equal to $A=\dfrac{1}{2} (16)(16) \\=128 \ mm^2$
Geometry: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281159
ISBN 13:
978-0-13328-115-6
Chapter 10 - Area - Chapter Review - Page 678: 20
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