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How big is 175 square miles?

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It's about 300,000 times as big as a Hockey rink.
In other words, 175 square miles is 298,812.850 times the size of a Hockey rink, and the size of a Hockey rink is 0.000003346576290 times that amount.
(per NHL specification)
Per National Hockey League Official Rules, a hockey rink should measure 60.96 m long by 25.908 m wide with a corner arc radius of 8.5344 m, for a total area of about 0.000585650851 square miles. Ice hockey is believed to have developed from field hockey after players began holding games on ice rinks, which had been traditionally used for the sport of curling.
It's about one-three-hundred-fifty-thousandth as big as The Land area of Earth.
In other words, 175 square miles is 0.00000304320 times the size of The Land area of Earth, and the size of The Land area of Earth is 328,600 times that amount.
The Earth has a land area of 57,506,000 square miles. Only an estimated one-eighth of this area — or 7,188,400 square miles — is inhabitable by humans, with uninhabitable terrain such as deserts and high mountains covering the rest.
It's about 400,000 times as big as Fort Knox.
In other words, 175 square miles is 384,000 times the size of Fort Knox, and the size of Fort Knox is 0.00000260 times that amount.
(a.k.a. the United States Bullion Depository, a.k.a. "Gold Vault") (Kentucky)
The United States Bullion Depository, commonly referred to by the metonym "Fort Knox" (in spite of the fact that the Depository is not located on the Fort proper), measures 32.0 m (105 ft) by 36.9 m (121 ft), for a total area of about 0.000456 square miles. The Depository is most famous for housing the largest portion of the national gold reserve, but has also temporarily housed the original US Declaration of Independence, an original copy of the US Constitution, and other important documents, kept there for safe keeping during World War II.
It's about 900,000 times as big as a Basketball court.
In other words, 175 square miles is 914,474.22680 times the size of a Basketball court, and the size of a Basketball court is 0.0000010935245310 times that amount.
(per NBA regulation)
Per NBA rules , a basketball court should measure 29.5656 m long by 16.764 m wide, for a total area of 0.0001913667929 square miles. The first basketball game, held in a Springfield Massachusetts YMCA, was played on a court half the size of today's NBA standard and ended with a score of 1-0.
It's about 1,500,000 times as big as an IMAX screen.
In other words, 175 square miles is 1,280,000 times the size of an IMAX screen, and the size of an IMAX screen is 0.00000078130 times that amount.
(standard)
An IMAX movie theater screen measures 22 m (72 ft) by 16 m (52 ft) for a total area of 0.0001368 square miles. Because the film used in an IMAX movie is more than eight times larger than regular film, the platters of a two-and-a-half hour feature film can weigh up to 250 kg (550 lbs).
It's about 1,500,000 times as big as a Tennis court.
In other words, 175 square miles is 1,737,435.90 times the size of a Tennis court, and the size of a Tennis court is 0.00000057556080 times that amount.
(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 0.00010068 square miles. Courts may be surfaced with crushed red stone, shale, brick, hard-soil grass, or asphalt.
It's about 30,000,000 times as big as a Parking Space.
In other words, 175 square miles is 30,200,000 times the size of a Parking Space, and the size of a Parking Space is 0.00000003310 times that amount.
(a.k.a Parking Stall) (average; surface lot; North America)
An average-size parking space in a North American surface lot measures 0.000005790 square miles. 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.