Ah! thanks. So the resulting number will be the large diameter? the height stays unchanged? e.g. say the small end is 1" the large end is 3" so 3-1=2 - I'll use 2 as the bottom diameter.Subtract the diameter of the small end from the large end now you have a point at the top
I could just do that but I felt I should use both methods to make sure I'm on the right track. More as an academic exercise than anything else.WHAT WOULD BE THE MATTER WITH USING A PROTRACTOR?
Not sure I understand your post-4 example, but here is a sketch with resultant dimensions. If your calculator spits out these angles, you are good to go.
You can't solve the problem as shown. You need to specify the small diameter too.
Let D be the big diameter and 'd' be the little diameter then R and r will be their radii respectively. Let H be the height of the cone.
R = D/2
r = d/2
Tan (angle) = (R-r)/H which means: angle = Arctan (R-r)/H
Ray