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  • Card 7 / 8:
    eccentricity

    the ratio of the distances from a point   P   on the graph to the focus   F   and to the directrix   D   represented by   e = P F P D , where   e   is a positive real number

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Source:  OpenStax, College algebra. OpenStax CNX. Feb 06, 2015 Download for free at https://legacy.cnx.org/content/col11759/1.3
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