area_rectangle = width × length
= 4 in × 12 in
= 48 sq in
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That would depend on the length of the rectangle which has not been given but the area of a rectangle is length times width
Area of rectangle: 12 times 4 = 48 square cm
12 square inches.
32 inches squared
Assuming that this is not a trick question and the rectangle has corners of 90 degrees one could assume with reasonably safety that the area is 40 square inches.