Christian S.

# What is the surface area of a prism whith these lengths A solid with six rectangular faces that has length 3 inches, width 9 inches, and height 12 inches.

It is a prism and it is asking for the Surface area.

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Christian S.

So what is the equation for solving?

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10/31/17

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

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