Definition:Focal Radius
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Definition
Let $\KK$ be a conic section.
Let $P$ be a point on $\KK$.
A line segment between $P$ and a focus of $\KK$ is called a focal radius of $\KK$.
Also see
- Results about focal radii can be found here.
Sources
- 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): focal radius
- 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): focal radius