The volume of a cylinder:
\(V=\pi r^2h\)
r - the radius, h - the height.
The radius is half the diameter.
The height is three times the radius.
\(d=6 \ in \\
r=\frac{6}{2} \ in=3 \ in \\ h=3r=3 \times 3 \ in = 9 \ in \\ \pi \approx 3.14\)
\(V=3.14 \times 3^2 \times 9=3.14 \times 9 \times 9=3.14 \times 81=254.34\)
The volume is 254.34 in³.
