12.3 The Parabola - Algebra and Trigonometry | OpenStax
https://openstax.org/books/algebra-and-trigonometry/pages/12-3-the-parabola
WebA parabola is the set of all points (x, y) (x, y) in a plane that are the same distance from a fixed line, called the directrix, and a fixed point (the focus) not on the directrix. In Quadratic Functions , we learned about a parabola’s vertex and axis of symmetry.
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