



 
Patty, You didn't tell us the thickness of the border, but if you know the thickness I can help you calculate the volume. First use our volume calculator to calculate the volume of a cylinder of radius 14.5 feet and the thickness you want. Use our volume calculator again to calculate the volume of a cylinder with the same thickness and radius 13 feet.
The volume of the border is the difference between the volumes of the large cylinder and the small cylinder. I hope this helps,  


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