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12-03-2018
Mathematics

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What is the length of each edge of a cube if its surface area is 486 square units?

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12-03-2018

SA = 2LW + 2LH + 2WH

Since it is a cube, all of the dimensions, LWH, will be the same.

SA = 2s^2 + 2s^2 + 2s^2

SA = 6s^2486 = 6s^2

Divide both sides by 681 = s^2Take the square root of both sides. 9 = s

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