Relationships Between Lines

Relationships Between Lines


    Define collinear, coplanar, parallel, perpendicular and skew.


    Present how to use symbols to indicate parallel (ex  ǀǀ ) and perpendicular relationships (ex  ).


    Provide examples that allow practice identifying the new terms. 


This packet should help a learner seeking to understand the definitions of collinear, coplanar, parallel, skew and perpendicular and their relationship to points, lines and planes.

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Collinear Points

This video introduces the concept of collinear points.

Coplanar Lines

This video provides an introduction to the ways in which two lines that exist entirely in the same plane (coplanar lines) can interact.

Source: Paul on Guaranteach

Parallel Lines

This video explains the concept of parallel lines and the notation used to indicate that two lines are parallel.

Source: Paul on Guaranteach

Skew Lines

This video introduces the concept of skew lines.

Perpendicular Lines

This video introduces the concept of perpendicular lines and how they are notated.

Source: JasmineWanek on Guaranteach

Practice Problems

This slideshow allows the learner to test their knowledge of the material in this packet.