Question

what is the surface area of the cube? 12 mm 12 mm 12 mm square millimeters

Explanation:

Step1: Recall surface - area formula

The surface - area formula of a cube is $S = 6a^{2}$, where $a$ is the side - length of the cube.

Step2: Substitute the side - length value

Given $a = 12$ mm, we substitute it into the formula: $S=6\times(12)^{2}$.

Step3: Calculate the result

First, $(12)^{2}=144$, then $6\times144 = 864$ square millimeters.

Answer:

864