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U.S. silver dollars issued from 1836 to 1935 have the following approximate dimensions: Diameter - 38.1 mm; early dates were slightly larger Weight - 26.7 gm Composition - 90% silver, 10% copper There were slight variations over that century but the above values are the most common dimensions.
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On paper = 2 dimensions Physical = 3 dimensions Examples: a square is 2 dimensions and a cube is 3 dimensions a circle is 2 dimensions and a ball is 3 dimensions
A ray can be in 2 dimensions, in 3 dimensions, or in fact in any number of dimensions.
the plane, or xy plane, has two dimensions space has 3 dimensions