The side of a cone is - not surprisingly - conical is shape. Its net is a sector of a circle.
The curved surface (or face) of the cone.
Triangle
Tilt of cutting plane is between (perpendicular to axis of the cone) and (parallel to the side of the cone).
A cone has one side. (The bottom) Because the other surface is curved, it does not count as a side. It is the same concept as a sphere.
A face is a polygon. There are none on a cone. There is only one vertex at the top of the cone. Although the cone does not have a face it does have a lateral side and a base.
Circle: If the knife is perpendicular to the axis of the cone.Ellipse: If the knife is between (perpendicular to the axis of the cone) and (parallel to the side of the cone).Parabola: If the knife is between (parallel to the side of the cone) and (parallel to the axis of the cone).Hyperbola: If the knife is parallel to the axis of the cone.Triangle: If the knife is perpendicular to the base of the cone.Point: If the knife is parallel to the base the cone and through the apex
The side of a cone is - not surprisingly - conical is shape. Its net is a sector of a circle.
parasite or secondary cone
The curved surface (or face) of the cone.
If these forms are all solid, a sphere has one side and face, a cone two, and a cylinder three. If there are hollow, they have one more face than side.
a parabola
Triangle
Tilt of cutting plane is between (perpendicular to axis of the cone) and (parallel to the side of the cone).
A cone has one side. (The bottom) Because the other surface is curved, it does not count as a side. It is the same concept as a sphere.
A volcanic cinder cone.
triangle