Question

check out this cube: find the surface area of the cube (above) using its net (below).

Explanation:

Step1: Recall surface - area formula

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

Step2: Identify side - length

From the problem, the side - length $a = 3$.

Step3: Calculate surface area

Substitute $a = 3$ into the formula: $S=6\times3^{2}=6\times9 = 54$.

Answer:

54