# Difference between revisions of "Locus Tool"

From GeoGebra Manual

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: {{Example| 1=<br /> | : {{Example| 1=<br /> | ||

::* Type <code>f(x) = x^2 – 2 x – 1</code> into the ''Input Bar'' and press the'' Enter-key''. | ::* Type <code>f(x) = x^2 – 2 x – 1</code> into the ''Input Bar'' and press the'' Enter-key''. | ||

− | ::* Place a new point ''A'' on the ''x''-axis (see [[New Point Tool|New Point]] tool; see [[Point Command|Point]] command). | + | ::* Place a new point ''A'' on the ''x''-axis (see [[Image:Tool New Point.gif]][[New Point Tool|New Point]] tool; see [[Point Command|Point]] command). |

::* Create point <code>B = (x(A), f'(x(A)))</code> that depends on point ''A''. | ::* Create point <code>B = (x(A), f'(x(A)))</code> that depends on point ''A''. | ||

::* Select tool [[Image:Tool_Locus.gif]] and successively click on point ''B'' and point ''A''. | ::* Select tool [[Image:Tool_Locus.gif]] and successively click on point ''B'' and point ''A''. |

## Revision as of 08:11, 8 July 2011

- Select a point
*B*that depends on another point*A*and whose locus should be drawn. Then, click on point*A*to create the locus of point*B*(see also Locus command). **Note:**Point*A*has to be a point on an object (e. g. line, segment/interval, circle).**Example:**

- 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 New Point tool; see Point command). - Create point
`B = (x(A), f'(x(A)))`

that depends on point*A*. - Select tool and successively click on point
*B*and point*A*. - Drag point
*A*along the*x*-axis to see point*B*moving along its locus line.

- Type