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Search Results for “directrix”

By Phil Todd
Parabola Directrix
Explore the focus and directrix of a parabola

Tags: parabola, focus, directrix

By Phil Todd
Focus Directrix Parabola
Try to set the focus and directrix of a parabola so it matches one with a given equation

Tags: parabola, focus, directrix

By admin
Rolling Parabola
A curiosity of a parabola rolling on top of an identical parabola without slipping is that its focus follows a straight line.  The hands of our clock join the vertex of each parabola to its focus.  As the parabolas roll with time, the hands point along a straight line.  This line is in fact the directrix of the parabola they are rolling along.

Tags: clock


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