To calculate the square footage, we need everything in feet or in inches. Since we are going to end in square feet, it is easiest to convert everything to feet first. 7 inches is equal to 7/12 feet, since there are 12 inches in a foot. 4 feet and 7 inches is equal to 4 and 7/12 feet, or 55/12 feet if you make it into an improper fraction. Then you simply multiply 7/12 and 55/12 together to get the square footage, which would be 385/12 feet, or 32 feet and 1 inch.
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The square footage of a baseball field is 4,569ft2
Multiplying length by width equals square footage
Read your own question! The square footage is 20!
The square footage of a radius is meaningless, but if you mean the square footage of a circle of radius say R, the answer is 3.142 x R x R