# Definition:Conic Section/Reduced Form/Parabola

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## Definition

Let $K$ be a parabola embedded in a cartesian coordinate plane.

As a Parabola has no Center, it is not possible to define the reduced form of a parabola in the same way as for the other classes of conic section.

Instead, $K$ is in **reduced form** if and only if:

- $(1)$ its focus is at the point $\left({c, 0}\right)$
- $(2)$ its directrix is aligned with the line $x = -c$

for some $c \in \R_{> 0}$.