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The geometric definition of a parabola is the set of all points whose distance from a fixed point, the focus, is equal to its distance from a fixed line, the directrix. On this web page, you will explore the geometric definition of a parabola and see how the focus and directrix effect the parabola's shape. You'll also see how parabolas can model different real world situations, including water fountains, projectiles, and the cables supporting the Verrazano Narrows Bridge.
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