From GeoGebra Manual
- Successively select at least three points which will be the vertices of the polyline. Finally select the starting point again to finish the polyline.
- Holding down the Alt key when drawing a Polyline allows to get angles that are a multiple of 15°.
Select a set of spreadsheet cells where the selected cells form pairs across rows or columns. Then, click on the tool button to open a dialog for naming, modifying and creating a polyline.