Changes

* Digital : Computer, geogebra application, projector.

* Digital : Computer, geogebra application, projector.

* Non digital : Worksheet and pencil.

* Non digital : Worksheet and pencil.

* Geogebra files : [https://ggbm.at/jaddqxg9 Parallellines-1.ggb]

* Geogebra files : [https://ggbm.at/z9mupk9n Parallellines-1.ggb]

{{Geogebra|jaddqxg9}}

{{Geogebra|z9mupk9n}}

===Process (How to do the activity)===

===Process (How to do the activity)===