r=7ft
h=16ft
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If the total area of a cylinder is 90pi (282.6) and the height is 12, the radius will be three (3).
Total surface area is 176 units2
Total surface area = (2*pi*radius2)+(pi*diameter*height)
1. Find the surface area of the whole cylinder 2. Find the area of one of the two circles on either end of the cylinder 3. Multiply the circle's area by two and subtract their area from the total surface area 4. Now you have the surface area of an unclosed cylinder!
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