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Assume the diameter is 48" = 4'

Then the surface area (A) of the column is A = 2πrh, where r is the radius = 2' and h is the height = 11'.

Therefore A = 2π2 x 11 = 44π = 138.23 square feet.

9 square feet = 1 square yard. Then 138.23 sq ft = 138.23/9 = 15.36 sq yd (2dp)

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