\(197.92 in^{2}\)

Explanation

The volume of a tube is given by the formula \(V=\pi r^{2} \times h\) where r is the radius of the tube and h is its height. By definition, \( \pi\) is approximately 3.14 so:

\( V = 3.14 \times {3^2} \times 7 = 3.14 \times 9 \times 7 = 197.92 { in^2 } \)

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