Kenneth S. answered • 10/31/17

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the surface area consists of three pairs of congruent rectangular faces.

it will help you a great deal if you make a sketch and label Length, Width & Height with the given measures.

then just figure out each kind of surface(rectangle) area--LW, LH, WH and add those resulting areas AND MULTIPLY BY 2 to account for all six faces of the box (rectangular prism).

Christian S.

I tried and it didnt work'

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10/31/17

Kenneth S.

THE EQUATION FOR SOLVING" tells me that you are just hoping for a magic formula, without having made a perspective type drawing of the box. L=3, W=9, H=12 as stated.

The front of the box, a rectangle, is congruent to the back of the box, and each has area LH = 3(12)

The sides of the box are rectangles, each has area WH = 9(12)

The top and bottom of the box are rectangles, each having area LW = 3(9).

Please compute each of those products listed above, add them, and then double the result to get _____ sq. in.

So you see that the important idea here is VISUALIZATION, DRAWING, LABELING and thinking about all of the components of total surface area. Analysis & depth of thinking is the key, not a magic formula.

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10/31/17

Christian S.

10/31/17