# Guldin or it's not necessary? "Surface" of revolution 2

Calculus Level pending

Let the square given by $\{(x,y) \in \mathbb{R}^2 ;1 \leq x \leq 3,\quad 1 \leq y \leq 3\}$ rotating around $$x$$-axis in $$\mathbb{R}^3$$.

The volume of the "surface" of revolution obtained can be written as $$A\pi$$.

Submit $$A$$.

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