en.wikipedia.org/wiki/Parabola

A parabola is a two-dimensional, mirror-symmetrical curve, which is
approximately U-shaped when oriented ...

www.purplemath.com/modules/parabola.htm

Introduces the terms and equations related to parabolas in the context of conics.
Relates ... Show how to 'read' from the 'conics' form of the parabola equation.

www.mathwarehouse.com/geometry/parabola/

Parabola--its graph, forms of its equation, axis of symmetry and much more
explained visually.

www.khanacademy.org/math/algebra2/intro-to-conics-alg2/focus-and-directrix-of-a-parabola-alg2/v/equation-for-parabola-from-focus-and-directrix

The equation of a parabola is derived from the focus and directrix, and then the
general formula is used to solve an example.

www.analyzemath.com/parabola/Equation.html

This is an applet to explore the equation of a parabola and its properties. The
equation used is the standard equation that has the form ...

www.sciencehq.com/math-formulas/formulas-for-parabola.html

Formulas for Parabola. Parabola is a Greek word which refers to a particular
plane curve. In general words, parabola can also be define as a plane curve of
the ...

formulas.tutorvista.com/math/parabola-formula.html

Axis of symmetry of a parabola is a line that runs down its center and passes
through the focus and vertex of the parabola and perpendicular to its directrix
thus ...

www.vitutor.com/geometry/conics/parabola_formulas.html

Parabola formulas, vertical and horizontal parabolas, axis on the y-axis and the x
-axis and parabolas with vertex at the origin.

www.mathsisfun.com/geometry/parabola.html

parabola. When you kick a soccer ball (or shoot an arrow, fire a missile or throw a
stone) it arcs up into ... Example: Where is the focus in the equation y<sup>2</sup>=5x ?

www.clausentech.com/lchs/dclausen/algebra2/parabolas.htm

Parabola Formulas. Home Up. Parabolas: Standard Form (Vertex Form) ... If "a" is
negative the parabola opens down and has a maximum value. |a| = 1; normal ...