Answer:
By width, if you mean diameter = 12 ft.
Radius = 6 ft.
Height = 13 ft.
π = 3.14
Area of a cone = 1/3πr^2h
= 1/3 x 3.14 x 6 x 6 x 13
= 3.14 x 12 x 13
= 3.14 x 156
= 489.84 ft.^3
Hope this helps you!
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