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How big is 770 square millimeters?

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It's about as big as a Secure Digital (SD) card
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-thirds times as big as a Quarter
In other words, 770 square millimeters is 1.666 times the size of a Quarter, and the size of a Quarter is 0.6002 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 two times as big as a Postage Stamp
In other words, 770 square millimeters is 2 times the size of a Postage Stamp, and the size of a Postage Stamp is 0.5 times that amount.
(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 times as big as a Nickel
In other words, 770 square millimeters is 2.179 times the size of a Nickel, and the size of a Nickel is 0.4589 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-and-a-half times as big as a Penny
In other words, 770 square millimeters is 2.7 times the size of a Penny, and the size of a Penny is 0.37 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 three times as big as a Dime
In other words, 770 square millimeters is 3.06 times the size of a Dime, and the size of a Dime is 0.3271 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, 770 square millimeters is 0.14 times the size of a Post-it® Note (3M), and the size of a Post-it® Note (3M) is 7.1 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.