Hello Michael,

Right on the money, thank you very much for your help, I don't think I would have figured that out despite passing the first grade.

You're welcome!

And you're probably all set now because you already know the height and top/bottom radius of your cone.

It should also be possible to calculate the bottom radius just given those 2 points as well, to do that you'd measure the radius at each of those points and get the change in radius, then multiply that by the same angular scale factor (360 / 288.0962488) and that should give you the change in radius for a full turn, so multiply that by how many turns you want and add that to the top radius to get the bottom radius.

- Michael