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Cone

A cone is a three-dimensional geometic shape. It consists of a base having the shape of a circle and a curved side (the lateral surface) ending up in a tip called the apex or vertex.

See the figure below.

Types of cones

Cones are divided into at least two categories:

Right circular cone

Drawing of a right circular cone
The angle between the lateral surface and the base is the same all around the cone.
The apex is positioned right above the base’s center point.

Oblique cone

Drawing of a oblique cone
The angle between the lateral surface and the base is not the same all around the cone.
The apex is not positioned right above the base’s center point.