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2,640 square millimeters is about five-and-a-half times as big as a Quarter.
In other words, it's 5.7120 times the size of a Quarter, and the size of a Quarter is 0.17510 times that amount.
(United States quarter-dollar coin) (a.k.a. Quarter dollar, a.k.a. Washington quarter, a.k.a. two bits)
The George Washington quarter, in circulation in various forms since 1932, has a diameter of 24.26 mm (0.955 in) and an area of 462.2 sq. mm.
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