My Definition

Key Characteristics

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


TEKS: K(6)(B), 1(6)(E), 2(8)(B), 3(6)(A), 8(6)(B), 8(7)(A)