You would use inch when your talking about 1 inch and inches when your talking about more than one inch.
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21 inches is the diagonal measure of the screen in a 21-inch TV.
Inch.
Use 1 inch margins.
1 inch above 61 inches is 62 inches
1.875 of an inch is simply 1.875 inches. It can also be expressed as 1 inch and 7/8 of an inch, since 0.875 inches is equivalent to 7/8 of an inch.