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How big is 897.60 square millimeters?

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It's about 1,500 times as big as a Ballpoint Pen Tip
In other words, 897.60 square millimeters is 1,300 times the size of a Ballpoint Pen Tip, and the size of a Ballpoint Pen Tip is 0.0008 times that amount.
(a.k.a. Biro, a.k.a. ball pen, a.k.a. dot pen) (for medium tip)
The most common size of ballpoint pen — a medium-tip — measures 0.7 sq. mm. A typical ballpoint pen can write more than 8,500 m (28,000 ft) before running out of ink.
It's about eleven-and-a-half times as big as a Nailhead
In other words, 897.60 square millimeters is 11.55 times the size of a Nailhead, and the size of a Nailhead is 0.0866 times that amount.
(for 11-gauge wire nai)
An 11-gauge nailhead measures 77.740 square millimeters. Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.
It's about three-and-a-half times as big as a Dime
In other words, 897.60 square millimeters is 3.563 times the size of a Dime, and the size of a Dime is 0.2807 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 three times as big as a Penny
In other words, 897.60 square millimeters is 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.
It's about two-and-a-half times as big as a Nickel
In other words, 897.60 square millimeters is 2.541 times the size of a Nickel, and the size of a Nickel is 0.3935 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, 897.60 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 one-and-nine-tenths times as big as a Quarter
In other words, 897.60 square millimeters is 1.942 times the size of a Quarter, and the size of a Quarter is 0.5149 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.