Definition:Ellipse/Minor Axis

Definition

 * EllipseParts.png

Consider an ellipse $K$ whose foci are $F_1$ and $F_2$.

For convenience, let $K$ be aligned in a cartesian coordinate plane such that:
 * $F_1$ and $F_2$ are located on the X-axis
 * the midpoint of the line $F_1 F_2$ is located at the origin.

Let a straight line $m$ be drawn through $O$ perpendicular to the major axis $M$ of $K$ so that it intersects the perimeter of $K$ at $\left({0, -b}\right)$ and $\left({0, b}\right)$.

Then $m$ is the minor axis of $K$.

Also see

 * Definition:Major Axis of Ellipse