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How big is 0.00021 square perches?

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It's about as big as a Post-it® Note (3M).
In other words, the size of a Post-it® Note (3M) is 1 times 0.00021 square perches.
(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® Note measures 0.00021 square perches 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.
It's about as big as a Playing Card.
In other words, the size of a Playing Card is 1.10 times 0.00021 square perches.
(ISO 216 B8 size)
A single ISO 216 B8-size playing card measures 0.00022 square perches. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 0.0001 square perches smaller.
It's about seven times as big as a Secure Digital (SD) card.
In other words, 0.00021 square perches is 6.90 times the size of a Secure Digital (SD) card, and the size of a Secure Digital (SD) card is 0.140 times that amount.
A Secure Digital (SD) card measures 3.2 cm by 2.4 cm for a total area of 0.0000300 square perches. SDXC Cards, the latest standard for the technology, will allow the cards to hold up to 2 terabytes of data.
It's about one-tenth as big as an Apple iPad.
In other words, 0.00021 square perches is 0.13270 times the size of an Apple iPad, and the size of an Apple iPad is 7.5360 times that amount.
(for 9.7 inch, Apple iPad Air MD785LL/B)
An Apple iPad measures 23 cm (9.4 in) x 17 cm (6.6 in) for a total device area of 0.001582 square perches. The base model iPad Air features 16 GB of storage capacity.
It's about ten times as big as a Postage Stamp.
In other words, the size of a Postage Stamp is 0.10 times 0.00021 square perches.
(average; United States dimensions)
A typical postage stamp measures an average of 0.0000200 square perches. 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 eleven-and-a-half times as big as a Quarter.
In other words, 0.00021 square perches is 11.490 times the size of a Quarter, and the size of a Quarter is 0.08703 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 0.000018270 square perches.
It's about fifteen times as big as a Nickel.
In other words, 0.00021 square perches is 15.03 times the size of a Nickel, and the size of a Nickel is 0.06653 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 0.000013970 square perches.