# Definition:Cone/Base

< Definition:Cone(Redirected from Definition:Base of Cone)

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## 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.

## Also see

## Comment

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