Answer:
1,415.09 ft3
Explanation:
First you would start off by finding the area of the circle. 13 squared is 169. Then you would multiply it by 3.14. You now have 530.66. Then you multiply it by 8 giving you 4,245.28. Then multiply that number by 1/3 which gives you 1,415.09 ft3.
Hope this helps!