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Eight.
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.
Many countries use a penny in their coinage, but they are of different sizes. You need to specify which country.
To estimate how many pennies are in a jar, first determine the volume of the jar in cubic inches or centimeters. Then, calculate the volume occupied by a single penny, which is approximately 0.36 cubic centimeters. Divide the total jar volume by the volume of a penny to get an estimate of how many pennies could fit, adjusting for any empty space or irregularities in packing. Alternatively, you can count a smaller quantity of pennies and scale up based on the jar's size.