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How big is 0.71640 square inches?

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It's about one-tenth as big as a Post-it® Note (3M).
In other words, the size of a Post-it® Note (3M) is 12 times 0.71640 square inches.
(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® Note measures 8.40 square inches 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 one-tenth as big as a Playing Card.
In other words, the size of a Playing Card is 12 times 0.71640 square inches.
(ISO 216 B8 size)
A single ISO 216 B8-size playing card measures 8.70 square inches. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 4.10 square inches smaller.
It's about one-eighty-fifth as big as an Apple iPad.
In other words, 0.71640 square inches is 0.01155 times the size of an Apple iPad, and the size of an Apple iPad is 86.580 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 62.03 square inches. The base model iPad Air features 16 GB of storage capacity.
It's about one-two-hundredth as big as an Airplane Tray Table.
In other words, 0.71640 square inches is 0.00458 times the size of an Airplane Tray Table, and the size of an Airplane Tray Table is 218 times that amount.
(average)
With wide variation among different models of airplanes, in-flight tray tables measure around 41.2 cm (16.5 in) x 24.1 cm (9.5 in) for a total area of 157 square inches. Flight safety rules require that the tray tables be upright and locked during takeoff and landing so as to reduce the risk of passenger abdominal injury.
It's about 650 times as big as a Ballpoint Pen Tip.
In other words, the size of a Ballpoint Pen Tip is 0.0015 times 0.71640 square inches.
(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 0.0011 square inches. A typical ballpoint pen can write more than 8,500 m (28,000 ft) before running out of ink.
It's about one-two-thousand-five-hundredth as big as a Bath Towel.
In other words, 0.71640 square inches is 0.00042646 times the size of a Bath Towel, and the size of a Bath Towel is 2,344.90 times that amount.
(for Fieldcrest Luxury Solid Towels)
Bath towels typically measure 142.24 cm (56 in) by 76.2 cm (30 in), for a total area of about 1,679.90 square inches. The city of Bursa, Turkey is known as the birthplace of the modern towel.
It's about one-eight-thousand-five-hundredth as big as a King Size Bed.
In other words, 0.71640 square inches is 0.000115 times the size of a King Size Bed, and the size of a King Size Bed is 8,700 times that amount.
(North American/Australian standard; length; mattress only)
A King-Size mattress measures 6,250 square inches in total area. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 7,750 square inches for those in positions of wealth or power.