Locus Tool

From GeoGebra Manual
Jump to: navigation, search

Select a point B that depends on another point A and whose locus should be drawn. Then, select point A to create the locus of point B.
Note: Point A has to be a point on an object (e.g. line, segment/interval, circle).
  • Type f(x) = x^2 – 2 x – 1 into the Input Bar and press the Enter-key.
  • Place a new point A on the x-axis (see Mode point.svg Point tool or Point command).
  • Create point B = (x(A), f'(x(A))) that depends on point A.
  • Select the tool Mode locus.svg Locus and successively select point B and point A.
  • Drag point A along the x-axis to see point B moving along its locus line.
Warning Warning: Locus is undefined, if the dependent point depends on Point Command with two parameters or PathParameter Command.
Note: See also Locus command.
© 2019 International GeoGebra Institute