21 feet is equal to 7 yards, or 6.4008 metres, or 640.08 centimetres.
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21 feet = 6.4 meters.
21
21 miles is exactly 21 miles long or if you prefer 36960 yards long. 21 miles is also 110880 feet long and 1,330,560 inches long.
21-ft x 22-ft = 462 ft2
21 feet long because 3 feet is in a yard so 3x7 is 21.