\begin{definition}[Definition:Ellipse/Minor Axis]
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Consider an ellipse $K$ whose foci are $F_1$ and $F_2$.
The '''minor axis''' of $K$ is the line segment through the center of $K$ perpendicular to the major axis of $K$ such that its endpoints are the points of intersection with $K$.
In the above diagram, $C_1 C_2$ is the '''minor axis''' of $K$.
\end{definition}