The answer will depend on pennies from which country!
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from 1 to infinite.. depends how many you want to put in it.
A radius squared fits pi times into a circle (The area of a circle divided by pi is the radius squared).
The largest square that could fit in a circle of diameter 10 inches has dimensions 5sqrt(2) inches by 5sqrt(2) inches.
Half the length of a side of the square.
circle or sphere