Question

what is the surface area of the cube with sides of 7 cm?
147
216
294
343

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 $a = 7$ cm, substitute it into the formula: $S=6\times7^{2}$.

Step3: Calculate the result

First, calculate $7^{2}=49$, then $6\times49 = 294$ $cm^{2}$.

Answer:

294