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  2. United States Mint coin sizes - Wikipedia

    en.wikipedia.org/wiki/United_States_Mint_coin_sizes

    23 mm 6.22 g 1864-1873 Quarter (Clad) 24.26 mm 5.67 g 1965–present Quarter (40% Ag) 24.3 mm 5.75 g 1976(S) Quarter 24.3 mm 6.25 g 1796–1964 Dollar 26.5 mm 8.1 g 1979–Present [3] $10 Eagle 27 mm 17.5 g 1795–1933 $25 American Gold Eagle 27 mm 17.5 g 1986–present $50 American Platinum Eagle 27 mm 15.6 g 1997–present Large Cent 28 mm 10 ...

  3. Quarter (United States coin) - Wikipedia

    en.wikipedia.org/wiki/Quarter_(United_States_coin)

    The quarter, formally known as the quarter dollar, is a coin in the United States valued at 25 cents, representing one-quarter of a dollar. Adorning its obverse is the profile of George Washington , while its reverse design has undergone frequent changes since 1998.

  4. Washington quarter - Wikipedia

    en.wikipedia.org/wiki/Washington_quarter

    No quarters were struck at any mint in 1933, as there was an oversupply caused by the 1932 issue. [22] [25] Unlike many earlier coins, the Washington quarter struck exceptionally well, bringing out its full details. This sharpness is possible because the designs of both sides were spread out, with no points of high relief. [17]

  5. United States quarter mintage figures - Wikipedia

    en.wikipedia.org/wiki/United_States_quarter...

    Below are the mintage figures for the United States quarter up to 1930, before the Washington quarter design was introduced. The following mint marks indicate which mint the coin was made at (parentheses indicate a lack of a mint mark): P = Philadelphia Mint. D = Denver Mint. S = San Francisco Mint. W = West Point Mint. O = New Orleans Mint. CC ...

  6. Quarter dollar - Wikipedia

    en.wikipedia.org/wiki/Quarter_dollar

    The obverse side of a United States quarter. The term "quarter dollar" refers to a quarter-unit of several currencies that are named "dollar". One dollar is normally divided into subsidiary currency of 100 cents, so a quarter dollar is equal to 25 cents. These quarter dollars (aka quarters) are denominated as either coins or as banknotes.

  7. Coin rotation paradox - Wikipedia

    en.wikipedia.org/wiki/Coin_rotation_paradox

    The outer coin makes two rotations rolling once around the inner coin. The path of a single point on the edge of the moving coin is a cardioid.. The coin rotation paradox is the counter-intuitive math problem that, when one coin is rolled around the rim of another coin of equal size, the moving coin completes not one but two full rotations after going all the way around the stationary coin ...

  8. 50 State quarters - Wikipedia

    en.wikipedia.org/wiki/50_State_Quarters

    [16] [17] In response to these criticisms, the Mint established the Artistic Infusion Program in 2003, hiring more professional artists and engravers to create better-looking designs for all commemorative coins. [15] The 50 State Quarters Program was the most popular commemorative coin program in the United States history; the United States ...

  9. List of unusual units of measurement - Wikipedia

    en.wikipedia.org/wiki/List_of_unusual_units_of...

    An Olympic-size swimming pool holds over 2 acre-feet of water For larger volumes of liquid, one measure commonly used in the media in many countries is the Olympic-size swimming pool. [47] A 50 m × 25 m (164 ft × 82 ft) Olympic swimming pool, built to the FR3 minimum depth of 2 metres (6.6 ft) would hold 2,500 m 3 (660,000 US gal).

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