It's about 400 times as big as a Ballpoint Pen Tip
In other words, 0.00000002850 hectares is 410 times the size of a Ballpoint Pen Tip, and the size of a Ballpoint Pen Tip is 0.0024 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 â€” a medium-tip â€” measures 0.0000000000700 hectares. A typical ballpoint pen can write more than 8,500 m (28,000 ft) before running out of ink.
It's about three-and-a-half times as big as a Nailhead
In other words, 0.00000002850 hectares is 3.6660 times the size of a Nailhead, and the size of a Nailhead is 0.27280 times that amount.(for 11-gauge wire nai)
An 11-gauge nailhead measures 0.0000000077740 hectares. Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.
It's about one-and-one-tenth times as big as a Dime
In other words, 0.00000002850 hectares is 1.1310 times the size of a Dime, and the size of a Dime is 0.88420 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 0.000000025190 hectares.
It's about as big as a Penny
It's about four-fifths as big as a Nickel
In other words, 0.00000002850 hectares is 0.80670 times the size of a Nickel, and the size of a Nickel is 1.240 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 0.000000035330 hectares.
It's about seven-tenths as big as a Postage Stamp
In other words, the size of a Postage Stamp is 1 times 0.00000002850 hectares.(average; United States dimensions)
A typical postage stamp measures an average of 0.0000000400 hectares. 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 three-fifths as big as a Quarter
In other words, 0.00000002850 hectares is 0.61660 times the size of a Quarter, and the size of a Quarter is 1.6220 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 0.000000046220 hectares.