Im trying to create a cone with the top cut off, im sure there

is a proper name object, I need to draw it in Autocad then cut it

out from paper and assemble it as a 3D model.

I know the diameter top and bottom and the slant length but I cant

figure out how to calculate the radius of the 2 arcs which will wrap

around the 2 circles.

I have uploaded a picture of what I mean.

formatting link

Thanks in advance

Bob