16Hit1600
Geometry and TrigonometryMediumSurface area of a cube from its volume

Geometry and Trigonometry practice question

A cube has a volume of 27 cubic centimetres. What is its total surface area, in square centimetres?

Answer: 54

The edge is the cube root of 27, which is 3. Each of the 6 faces has area 3² = 9, so the total is 6 × 9 = 54.

Common wrong answers

If you answered 9
9 is the area of ONE face. A cube has six.
If you answered 27
27 is the volume, not the surface area.
If you answered 36
36 is 4 × 9, counting only four faces; a cube has six.

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