What steps or formula would I use, to determine surface area, if I know a cylinder has a height of 5feet and a radius of 2ft., And, If a scale model of the cylinder is scaled up by a factor of 3, what is the surface area of the model, and I have tried it and come up w a few possible solutions such as 756.20ft^.2 , 791.68ft^.2 , 865.28ft^.2 , or 832.05ft^.2, but I am not sure.