The surface area of a cone is approximately 360 degrees. Depending on the size and depth of the cone it can vary. Many people think of an ice cream cone when determining this estimate but there is no direct connection between this estimate and any other realistic calculations. The circumfrence plus the lenght will give you the best and most descriptive compulation required in this equation. Many people will use a protractor to obtain this messurement. The most accurate solution to this problem is an individual solution.