Is 11ft the radius or diameter?
If it is the radius then the volume = 1/2 [4/3 * pi * r^3] (where * means multiply and ^3 means to the power of three or cubed)
So for a radius of 11ft, the Volume is 13,938.20 cu ft.
If the diameter is 11ft, then the radius will be 5.5ft and the Volume is 348.45 cu ft
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The answer depends on what 11 inch refers to: the radius, diameter or something else.
The volume of a hemisphere is equal to two thirds times pi times the radius cubed.
121 sq ft
Assuming it's a box shape, the volume will be 11 x 12 x 9 = 1,188 ft3, or, in cubic metres, 33.64 m3.
95.033 square feet.
154