@dave r said:

See the attached.

After drawing your cone, you can use a guideline to create a snap to line for the rotate tool. When you draw the cone, make sure there's a vertex on the base at your center of rotation.

To create the two parts after intersection the plane, you can either select one part and Move/Copy it away from the cone. Then delete the unneeded bit on the original. Or you can do as I did for demonstration purposes and copy the entire cone. Then delete the unneeded part on each copy.

Hi, thanks for the attachment. Question though. So how do you create a cone in the first place? When I create a circle, then an orthogonal triangle and do the Follow Me on the triangle, the flat bottom surface of the cone disappears, and I have to re-glue it once again.

Secondly, once I cut the cone with a new rectangular surface and erase the unwanted part, the cut is empty, i.e. has no surface drawn between the cut contour. Is there any way to keep it?

Thanks, once again.

Hi, I want to make a conic section, i.e. split a cone into two separate objects using a plane. So far I have been able only to leave a mark on the surface of the cone, i.e. an ellipse, parabola or hyperbola, but could not cut the cone into two parts though.

Any tips?

Also, would like to place the cone strictly on its side (think of kicking a traffic cone). Sketchup doesn't seem to allow to align the side to one of the axis (as it's rounded). Once again, any tips would be appreciated.

Thanks.