A cylinder does not have area, since it is a three dimensional object. Instead, it is usually described as having volume,
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area of the base*height
The area of the base of a cylinder is the same as the area of a circle. The equation for the area of a circle is: Pi r squared
use algebra to find the radius, then plug the height and radius into the surface area equation
So you know this is the equation you are suppose to be using. If the equation gives you the diameter of the cylinder then divide that number in half and plug the number you got into the equation. This is because the radius is half of the diameter. Otherwise, the only way to find the volume is if you have the area of the base. Then multiply that area by the height.
Surface Area = pi*r*(r + h) When you substitute for pi and h you will get a quadratic equation in r.