Determines the focus, directrix, and other related items for a parabola.

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- standard horizontal parabola equation is y
^{2}= 4cx - standard vertical parabola equation is x
^{2}= 4cy - If the x coefficient is negative, then parabola opens left
- If the x coefficient is positive, then parabola opens right

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- directrix
- line in a parabola not through the focus
- focus
- fixed point on the interior of a parabola used in the formal definition of the curve
- parabola
- a plane curve which is approximately U-shaped
- parabolas