Definition:Parabola/Directrix

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Definition

ParabolaFocusDirectrix.png


Let $K$ be an [Definition:Focus-Directrix Property of Parabola|parabola]] specified in terms of:

a given straight line $D$
a given point $F$

where $K$ is the locus of points $P$ such that the distance $p$ from $P$ to $D$ equals the distance $q$ from $P$ to $F$:

$p = q$


The line $D$ is known as the directrix of the parabola.


Sources