# Definition:Cone/Base

(Redirected from Definition:Base of Cone)

## Definition

Consider a cone consisting of the set of all straight lines joining the boundary of a plane figure $PQR$ to a point $A$ not in the same plane of $PQR$:

The plane figure $PQR$ is called the base of the cone.

## Comment

Hence the colloquial phrase base over apex as the description of a particularly flamboyant physical tumble.