Surface areas are measured in square units, such as square inches, square feet, square meters, etc. To determine the surface area, first ensure you have the length and width of the rectangle expressed in the same units (both in inches, both in feet, etc.), then multiply the length by the width: 2 feet x 3 feet = 6 square feet
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Rectangle
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if 3x4 is dimension of rectangle and 5 is the altitude, then, 49.035 sq. units is its surface area
314 square inches in total
Area of a rectangular prism = 2lw + 2lh + 2wh, where l is length, w is width, and h is height.