Correction for the size of a US Penny
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How big is 251.90 square millimeters?
It's about nine-tenths as big as a US Penny
The size of a US Penny is about 285 square millimeters.
(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.