126 cm2
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A cylinder with a diameter of 1 foot and 3 feet high has a surface area of 11 square feet.
Surface area of a sphere = 4πr²A= 4(3.14159) X 1A= 12.56 ft²
The surface area of a 21 foot in ground pool is 346.36 square feet.
22 square feet
It is not possible to answer the question since a square prism can have any length.