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.
This video introduces the concept of collinear points.
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
This video explains the concept of parallel lines and the notation used to indicate that two lines are parallel.
Source: Paul on Guaranteach
This video introduces the concept of skew lines.
This video introduces the concept of perpendicular lines and how they are notated.
Source: JasmineWanek on Guaranteach
