Definition:Major Axis
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Definition
The major axis of a central conic $\KK$ is the straight line passing through both foci of $\KK$.
This may or may not be defined as being terminated at the vertices of $K$ according to variations of definitions.
The distinction should be clear according to usage.
Major Axis of Ellipse
The major axis of $K$ is the line segment passing through both $F_1$ and $F_2$ whose endpoints are where it intersects $K$.
Major Axis of Hyperbola
Consider a hyperbola $K$ whose foci are $F_1$ and $F_2$.
The major axis of $K$ is the straight line passing through both of the foci of $K$.
Also see
- Results about the major axis can be found here.