Lines that extend to infinity in one or both directions, known as rays and construction
lines, respectively, can be used as references for creating other objects.

• A construction line (also known as an xline) is a linear object that passes through two points and extends to infinity in both
  directions.
• A ray is a linear object starts at a point, passes through a second point, and extends
  to infinity.

Both construction lines and rays are ignored by commands that display the drawing
extents.

Learning AutoCad

>Lines that extend to infinity in one or both directions, known as rays and construction lines, respectively, can be used as references for creating other objects.Lines that extend to infinity in one or both directions, known as rays and construction lines, respectively, can be used as references for creating other objects.… Join Jeff Bartels for an in-depth discussion in this video Drafting with construction lines and rays, part of AutoCAD 2009: 2D Drafting …Construction Lines XLINE vs RAY. Two commands allow us to draw infinite length construction lines. Use them wisely. Català – Castellano… Cadalyst tip reviewer Brian Benton reminds us that AutoCAD has other line objects called construction lines (or xlines) and rays that we can …line is used for line, segment , ray, conic, sector, function. I notice new users introduced to Geogebra geometry construction have  …Construction Lines And Rays. Video thumbnail for A Little Help Goes A Long Way – Construction Lines And Rays. 0:00:00.