These are the links to two slideshare presentations about operations with angles and line segments.
https://es.slideshare.net/Cnavarrovargas/line-segment-operations
https://es.slideshare.net/Cnavarrovargas/operations-with-angles
These are the links to two slideshare presentations about operations with angles and line segments.
https://es.slideshare.net/Cnavarrovargas/line-segment-operations
https://es.slideshare.net/Cnavarrovargas/operations-with-angles
This is a video that explains how to draw an hexafoil.