



 
Hi Mack, The volume $V$ of a circular cylinder is given by \[V = \; \pi \; r^2 h\] where $r$ is the radius of the base and $h$ is the height. You know that $h=11$ cm so all you need is the radius. The circumference $C$ of a circle is given by \[C = 2 \; \pi \; r\] where again $r$ is the radius. You know that $C=24.4$ cm so substitute this into the above expression and solve for $r.$ Substitute this value of $r$ into the expression for $V.$ This will give the volume in cubic centimeters. Penny 



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