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Quadratic locus equation

Author:Zoltán Kovács
Topic:Parabola
A quadratic locus equation in GeoGebra. We construct the parabola by using the synthetic definition.
  1. In Steps 1 and 2 line AB (denoted by "a") and point C are defined.
  2. In Step 3 we put point D on line a. Then in Steps 4-5-6 point E is constructed by Euclidean steps.
  3. Now the locus of point E while point D is moving on line a, is to be defined (Step 7).
  4. Finally in Step 8 we obtain the equation of the locus.
Under some systems and conditions the computation may not be fast enough, thus the animation will not be fluent. A simple way to avoid some computations is to narrow the available inputs to grid points. To do that, select Options > Point Capturing > Fixed to Grid. Now point D is also constrained to grid points, unfortunately. This behavior can, however, be improved. Turn on the next page to see how.

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