Because vertical angles always equal each other. linear pairs always equals 180 degrees always. hope this helps :)
Answer:

Step-by-step explanation:
The formula of a surface area of a cube:

The formula of a volume of a cube:

We have

Calculate the edge length (<em>a</em>).
<em>divide both sides by 6</em>

Calculate the volume of a cube:

Answer:
Your answer is :
B. 6a^2 + 3ab
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Step-by-step explanation: