<PRE><B>Question 890997</B>
Use the formula for the volume of a cylinder.


Volume of a cylinder = &amp;#9573; r² h

We need the radius which is 1/2 of the diameter.

Well, what is 1/2 of 9?  It is 4.5, right? That is our radius.

V =  &amp;#9573; (4.5cm)² (20cm)

V = &amp;#9573; (20.25cm)(20cm)

V = &amp;#9573; (405cm)^3

Answer:  V =  405&amp;#9573;(cm)^3

Remember that volume is measured in cubic units. </PRE>