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Parallelogram is a quadrilateral with opposite sides both parallel and equal in length - commonly known as a rectangle.
Because we are measuring a square, we know that all four sides are equal in length. Therefore each side has an equal length of 42ft, or else by definition it would not be a square, but a rectangle. To measure the area of said square me simply multiply its length by its height. 42 x 42 = 1764
Four letters?
a rectangle
A square has four sides of equal length!