We know from our Cylinder Net, that the length of the rectangle is. If the diameter, \(d\), of the circular cross-section is given, this is halved to find the radius.ĭepending on the orientation of the cylinder, the length of the cylinder is its height. Surface area of Cylinder 2 x (Area of circle) Area of Rectangle. \(r\) is the radius of the circular cross-section and \(h\) is the height of the cylinder. The expression for working out the total surface area of a cylinder is
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