Answer:

Step-by-step explanation:
To find the volume of the sphere we need to know its radius.
And the radius can be found with the information we have about the surface area.
The formula for the surface area is as follows:

from this formula we clear the radius r:

and we substitute the known value of the surface area, and also the value of
:

and now that we know the radius we find the volume:

the volume of the sphere is 
Please be a little more specific on what you want to ask.
I can be of some help.
I think you guys are using a^2 + b^2 = c^2
the equation would be
x^2 + 2x^2 = 6^2