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How big is 662.20 square millimeters?

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It's about nine-tenths as big as a Secure Digital (SD) card.
In other words, 662.20 square millimeters is 0.860 times the size of a Secure Digital (SD) card, and the size of a Secure Digital (SD) card is 1.20 times that amount.
A Secure Digital (SD) card measures 3.2 cm by 2.4 cm for a total area of 770 square millimeters. SDXC Cards, the latest standard for the technology, will allow the cards to hold up to 2 terabytes of data.
It's about one-and-two-fifths times as big as a Quarter.
In other words, 662.20 square millimeters is 1.4330 times the size of a Quarter, and the size of a Quarter is 0.69780 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.
It's about one-and-nine-tenths times as big as a Nickel.
In other words, 662.20 square millimeters is 1.8740 times the size of a Nickel, and the size of a Nickel is 0.53360 times that amount.
(United States five-cent coin) (a.k.a. Jefferson nickel)
The nickel, in its current design since 1938, has a diameter of 21.21 mm (0.835 in) and an area of 353.3 sq. mm.
It's about two times as big as a Postage Stamp.
In other words, the size of a Postage Stamp is 0.50 times 662.20 square millimeters.
(average; United States dimensions)
A typical postage stamp measures an average of 400 sq. mm. One of the most prized stamps among collectors is the US-issued "Inverted Jenny" stamp printed in 1918, which features an upside-down image of Curtiss JN-4 ("Jenny") airplane; a single stamp sold for $977,500 at a 2007 auction.
It's about two-and-a-half times as big as a Penny.
In other words, 662.20 square millimeters is 2.320 times the size of a Penny, and the size of a Penny is 0.4310 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.
It's about two-and-a-half times as big as a Dime.
In other words, 662.20 square millimeters is 2.6290 times the size of a Dime, and the size of a Dime is 0.38040 times that amount.
(United States ten-cent coin) (a.k.a. Roosevelt dime)
The dime, in its current design since 1946, has a diameter of 17.91 mm (0.705 in) and an area of 251.9 sq. mm.
It's about one-tenth as big as a Post-it® Note (3M).
In other words, 662.20 square millimeters is 0.120 times the size of a Post-it® Note (3M), and the size of a Post-it® Note (3M) is 8.30 times that amount.
(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® Note measures 5,400 square millimeters in total area. In September, 1989, Hurricane Hugo swept through Charleston, South Carolina with winds up to 230 kph (140 mph), uprooting eight oak trees in Mr. Bruce Brakefield's yard, but leaving in place a Post-it® note attached to his front door.