18 square inches
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A cylinder having a radius of 7 feet and a height of 19.5 feet has a surface area of 1,165.53 ft2
The curved surface area is 155.19ft2
Surface Area = ~4,712.4 ft2
Surface Area = ~636.17 ft2
Total surface area of a cylinder = (2*p*radius2)+(pi*diameter*height)Total surface area = 1130.973355 or 1131 square feet to the nearest square foot.