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A square with a side length of 3 inches has an area of 9 square inches.
Area of the square = 9 square inchesArea = side * side= 3 inches * 3 inches= 9 square inches
You have given 3 dimensions and not the shape. For area you generally need two dimensions, like for a rectangle. The area of this is Length by width.
Perimeter: 7+3+7+3 = 20 inches Area: 7 times 3 = 21 square inches
Area of a rectangle = L W = (24 x 3) = 72 square inches.