You can put this solution on YOUR website! 14 ft diameter, 9 ft height?
14 ft radius, 9 ft height?
9 ft diameter, 14 ft height?
9 ft radius, 14 ft height?
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The formula for surface area is, where R is the radius of the cylinder, H is the height.
Now that you have the formula, you can plug in the correct values and calculate surface area.
Remember your final units will be square feet (feet*feet).