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Area and volume SAT question

Math · Geometry and Trigonometry · Hard · Answer it here, explanation included.

A cube has a volume of cubic units. What is the surface area, in square units, of the cube?

Enter a number or fraction (like 3/17 or 0.176). Press Enter to check.

ExplanationShow

The correct answer is . The volume of a cube can be found using the formula , where represents the edge length of a cube. It’s given that this cube has a volume of cubic units. Substituting for in yields . Taking the cube root of both sides of this equation yields . Thus, the edge length of the cube is units. Since each face of a cube is a square, it follows that each face has an edge length of units. The area of a square can be found using the formula . Substituting for in this formula yields , or . Therefore, the area of one face of this cube is square units. Since a cube has faces, the surface area, in square units, of this cube is , or .

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