DSQ: Calculating the surface area of a cube - GMAT Quantitative

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Question

Ron is making a box in the shape of a cube. He needs to know how much wood he needs. Find the surface area of the box.

I) The diagonal distance across the box will be equivalent to .

II) Half the length of one side is .

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Answer

To find the surface area of a cube, we need the length of one side.

Statement I gives the diagonal, we can use this to find the length of one side.

Statement II gives us a clue about the length of one side; we can use that to find the full length of one side.

The following formula gives us the surface area of a cube:

Use Statement I to find the length of the side with the following formula, where is the diagonal and is the side length:

So, using Statement I, we find the surface area to be

Using Statement, we get that the length of one side is two times two:

Again, use the surface area formula to get the following:

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