Parallel - describes lines in the same place that never cross or intersect.- they are marked using arrows.
Perpendicular - describes lines that intersect at right angles (90degrees)- they are marked using a small arrow.
measure the distance from: A to B = 8.9 cm B to C = 8.9 cm
E to F = 8.9 cm F to G = 8.9 cm
I to J = 8.9 cm J to K = 8.9 cm
Identify any parallel line segment line:
AE is parallel to BF
BF is parallel to CG
EI is parallel to FJ
FJ is parallel to GK
AI is parallel to CK
Parallel lines are always the same distance apart. No matter where you measure as long as you measure using perpendicular lines.
Now using the same picture ^, identify any perpendicular line segments.
AE is perpendicular to DF
BF is perpendicular to EG
CG is perpendicular to FH
1. Are line segments AE and DF parallel?
2. Are line segments DF and BE perpendicular?
3. Are line segments AC and BG perpendicular?
How do you know?
4. Would a line segment joining A to D be parallel to a line segment BE?
How do you know?
