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The formula to find the area of a rectangle is length times width.
The length of the rectangle is the distance between point A and point B, which is 5 - 2 = 3 miles.
The width of the rectangle is the distance between point A and point D, which is -1 - (-5) = 4 miles.
Therefore, the area of rectangle ABCD is 3 miles times 4 miles = 12 square miles.