for
#### Julia Neal

#### A parabola is the set of all points equidistant
from a line, called the directrix, and a fixed point, called the
focus.

Click **here**
to open a GSP sketch of a parabola generated by an animation and
a trace of a constructed point.

Click **here**
to open a GSP sketch of a parabola generated by an animation of
a point and a trace of the tangent line.

Here is the parabola generated by the locus
command from a constructed point.

####

####

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