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A square has one side with length 4.5 feet. The area of the square is ____.

A 20.25 square feet
Explaination
Squares have 4 sides that are the same length, and the area of a square is equal to its side squared, in this case 4.5*4.5, which is equal to 20.25.
B 16 square feet
C 18.50 square feet
D 25 square feet