To find the value of \( B \) (the area of the base) for a cylinder, we need to use the formula for the area of a circle, which is \( B = \pi r^2 \), where \( r \) is the radius of the base of the cylinder.
If the dimensions given indicate that the radius of the base is 7 inches, then the area \( B \) would be calculated as:
\[ B = \pi (7)^2 \]
Therefore, the correct expression to find the value of \( B \) is:
\(\pi(7)^2\) (pi times 7 squared).
So, the response would be:
π(7)².