Pull mode

Theorem of Thales discovered experimentally with the pull mode, when pulling the point along the semicircular arc, the angle remains constant ${\displaystyle 90^{\circ }}$

Parabola as locus / track curve
With a given guideline and focal point , a point is constructed on a point of the parabola. Then you drag the point along the guideline and leave a trace of its previous positions and draw the parabola with it . ${\displaystyle L}$ ${\displaystyle F}$ ${\displaystyle P}$ ${\displaystyle L}$ ${\displaystyle E}$ ${\displaystyle P}$ ${\displaystyle L}$ ${\displaystyle E}$

The term pull mode refers to the possibility of freely moving base points, but also lines , straight lines or function graphs , in dynamic geometry programs (i.e. dragging them), whereby the rest of the geometric construction adapts accordingly.

The track mode for an object means that if the construction changes dynamically, the old representations are not deleted and thus create a track. This property is particularly suitable for visualizing locus curves .

See also

• dynamic spatial geometry

literature

• Mathias Hattermann: The train mode in 3D dynamic geometry systems (DGS) [electronic resource] . Vieweg + Teubner, Wiesbaden 2011, ISBN 978-3-8348-8207-3 .
• Reinhold Haug: Learning to solve problems with digital media: Promotion of basic problem-solving techniques through the use of dynamic tools . Springer, 2011, ISBN 9783834886606 , pp. 21-35, 57-59

Web links

Commons : Train and Track Mode  - collection of images, videos and audio files

• Konrad Brunner: Introduction to Geonext . Uni Bayreuth (materials for teacher training), 2003, p. 3
• Module 4: Digital tools in math lessons - teaching and learning with dynamic geometry software (Geogebra version) . Further training for teachers in NRW, June 2010, pp. 14–15