



 
Hi Frank, The volume of a prism is the area of the base times height. The hexagon you describe is regular with side length 6 inches so you can find its area in square inches using Stephen's expression for the area of a regular polygon with n sides or a different technique he used for the area of a regular hexagon. Once you have the volume in cubic inches, say $A$ cubic inches you can use Google to find the volume in gallons. Just type $A$ cubic inches in gallons into the Google search window. Penny  


Math Central is supported by the University of Regina and the Imperial Oil Foundation. 