The rule of the volume of the cone is
[tex]V=\frac{1}{3}\pi r^2h[/tex]Since the diameter = 6 inches
Since the radius = 1/2 the diameter, then
r = 1/2 x 6 = 3 inches
h = 21 inches
Pi = 3.14
Substitute them in the rule
[tex]\begin{gathered} V=\frac{1}{3}\times3.14\times(3)^2\times21 \\ V=197.82in^3 \end{gathered}[/tex]Round it to the whole number
V = 198
