First of all it is highly unlikely to have a square foot. But if someone does have a square foot u should specify the shoe size. e.g. a size 10 US shoe will hold 132.3 pennies.
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It would be a 20 by 20 ft square
yes it can
Many countries use a penny in their coinage, but they are of different sizes. You need to specify which country.
Multiply width by length to get the area. The answer would be 54 square feet or 6 square yards.