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To determine which board Mia will use for the length of the shelter, we need to convert 3.25 feet to inches.
Since 1 foot is equal to 12 inches, 3.25 feet is equal to 3.25 x 12 = <<3.25*12=39>>39 inches.
Therefore, Mia will use the board that measures 39 inches for the length of the shelter.