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897.60 square millimeters is about three times as big as a Penny
In other words, it's 3.15 times the size of a Penny, and the size of a Penny is 0.317 times that amount.
(United States one-cent coin) (a.k.a. Lincoln penny, a.k.a. Cent, a.k.a. One cent piece)
The Lincoln penny, in its current design since 1909, has a diameter of 19.05 mm (0.75 in) and an area of 285.0 sq. mm.
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