Parallel Lines, Parallel Planes, Skew Lines

Name a line parallel to AD

• EH

• AB

• DC

• HG

Name a line parallel to AB

• EH

• DC

• AE

• FG

Lines DE, AB, and GC appear to be _________

• parallel

• perpendicular

• skew

Name a line skew to FG

• EH

• DC

• AD

• FB

If two lines do not intersect then they are coplanar and parallel, or skew. Lines AB and CD do not intersect. Use the law of detachment to make a conclusion.

• Lines AB and CD are parallel and not coplanar.

• Lines AB and CD are parallel and coplanar or they are skew.

• Lines AB and CD are skew.

• No Conclusion can be made.

What are parallel lines?

• Two lines that never cross

• Two lines that intersect

• Two lines that intersect at 90 degrees

• Two lines

Name a line skew to AD

• EH

• AB

• CG

• EH

Name a line skew to AB

• EH

• DC

• AE

• HG

Are lines j and k skew?

• yes

• no

Assume lines l & m are parallel.

Based on the image, if m∠7=100°, then m∠3=?

• 100°

• 80°

• 180°

• 90°