Posted by Samantha on .
I need to find the approximate surface area of a cone with the R=5 and L=6. I thought I figured it out by 3.14(5)(6) which will give me 94.2 I then would take 94.2 +3.14(5)squared and I came up with 172.7, but my answer should be either 20m squared, 98m squared, 118m squared or 67m squared, what did I do wrong?

Algrebra 
Steve,
I think you have written it down wrong. If the diameter of the cone is 5, then R=2.5 and the area is 66.7, or 67.