\begin{definition}[Definition:Diameter of Central Conic/Also defined as]
Some sources define the '''diameter''' of a central conic $\KK$ as a chord of $\KK$ which passes through the center of $\KK$.
This is a perfectly adequate definition of a '''diameter of an ellipse'''.
Indeed, in the context of a circle, this is how a '''diameter''' is routinely defined.
However, it falls short of providing a full definition of the '''diameter of a hyperbola'''.
Hence, for the general central conic, and one that is not specifically a circle, this definition is not used on {{ProofWiki}}.
\end{definition}