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How big is 0.0400 square meters?

It's about as big as an Apple iPad
The size of an Apple iPad is about 0.04002 square meters.
(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 0.04002 sq. m (62.04 sq. in). The base model iPad Air features 16 GB of storage capacity.
It's about two-fifths as big as an Airplane Tray Table
The size of an Airplane Tray Table is about 0.1010 square meters.
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 0.101 sq. m. 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 seven times as big as a Playing Card
The size of a Playing Card is about 0.0056 square meters.
(ISO 216 B8 size)
A single ISO 216 B8-size playing card measures 0.0056 square meters. Although this size is the most common playing card, many casinos use the smaller "bridge size" card — 0.0026 square meters smaller.
It's about seven-and-a-half times as big as a Post-it® Note (3M)
The size of a Post-it® Note (3M) is about 0.0054 square meters.
(3M) (generically sticky notes, a.k.a. repositionable notes, a.k.a. repositional notes)
A Post-it® Note measures 0.0054 square meters 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-twenty-fifth as big as a Bath Towel
The size of a Bath Towel is about 1.0838 square meters.
(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 1.0838 sq. m (12 sq. ft). The city of Bursa, Turkey is known as the birthplace of the modern towel.
It's about 50 times as big as a Secure Digital (SD) card
The size of a Secure Digital (SD) card is about 0.00077 square meters.
A Secure Digital (SD) card measures 3.2 cm by 2.4 cm for a total area of 0.00077 square meters. SDXC Cards, the latest standard for the technology, will allow the cards to hold up to 2 terabytes of data.
It's about 85 times as big as a US Quarter
Flag of The US
The size of a US Quarter is about 0.0004622 square meters.
(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 0.0004622 square meters.
It's about 100 times as big as a Postage Stamp
Flag of The US
The size of a Postage Stamp is about 0.0004 square meters.
(average; United States dimensions)
A typical postage stamp measures an average of 0.0004 square meters. 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-one-hundredth as big as a King Size Bed
The size of a King Size Bed is about 4.03 square meters.
(North American/Australian standard; length; mattress only)
A King-Size mattress measures 4.03 sq. m in total area. Although most antique beds were smaller than modern beds, it was not uncommon for beds in the medieval Europe to reach 5 sq. m for those in positions of wealth or power.
It's about 100 times as big as a US Nickel
Flag of The US
The size of a US Nickel is about 0.0003533 square meters.
(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 0.0003533 square meters.
It's about 150 times as big as a US Penny
Flag of The US
The size of a US Penny is about 0.000285 square meters.
(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 0.000285 square meters.
It's about 150 times as big as a US Dime
Flag of The US
The size of a US Dime is about 0.0002519 square meters.
(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 0.0002519 square meters.
It's about one-three-hundred-fiftieth as big as a Parking Space
The size of a Parking Space is about 15 square meters.
(a.k.a Parking Stall) (average; surface lot; North America)
An average-size parking space in a North American surface lot measures 15.0 sq. m. Due to the high real estate prices at the time, parking spaces in a densely-populated part of Manhattan would sell for an average of $165,000 in 2007, with some spaces fetching up to $225,000.
It's about 500 times as big as a Nailhead
The size of a Nailhead is about 0.000077740 square meters.
(for 11-gauge wire nai)
An 11-gauge nailhead measures 0.000077740 square meters. Nails have been used since ancient times; archaeologists have discovered Ancient Egyptian nails that are over 5,000 years old.
It's about one-six-thousand-five-hundredth as big as a Tennis court
The size of a Tennis court is about 260.871740 square meters.
(per ITF specification; for doubles)
Per International Tennis Federation Rules of Tennis 2009, a doubles tennis court should measure 23.7744 m long by 10.9728 m, for a total area of about 260.87174 sq. m. Courts may be surfaced with crushed red stone, shale, brick, hard-soil grass, or asphalt.
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