Coldplay and guest,
The volume of any prism is the area of the base times by the height.
A cylinder is a circular prism.
The volume of a pyramid is 1/3 * the volume of prism (that it is a part of) and a cone is a pyramid
Volume of cone = 1/3 * area of circular base * height units cubed
Hang on, that was volume, You want surface area ?
http://www.mathsteacher.com.au/year10/ch14_measurement/18_cone/20cone.htm