The following are true of a cone:

• Its base is a circle.


• It has a single vertex, which is also called its apex.


• The lateral surface is "curved."


• A line segment can be drawn from the apex to every point on the base.


• It has one base.


• If a plane intersects the cone at any point other than the apex and is parallel to the base, the cross section is a circle that is not congruent to the base.

A cone has one base and one vertex, regardless of orientation.

Cone Activity