Polyline Tool

Activate the tool, then select consecutively at least three existing points (or click/tap at least three distinct positions in the Graphics View) which will be the vertices of the polyline (polygonal chain). End the creation of the polyline by clicking its first vertex again.

Holding down the Alt (MacOS : option) key when drawing a polyline allows to get angles between segments that are multiple of 15°.

Select a set of spreadsheet cells that define ordered pairs across rows or columns. Then select the tool to open a dialog for naming, modifying and creating the polyline with vertices at the points with given ordered pairs.