Distinguish between lines, line segments, parallel and perpendicular lines.
Please enable Java for an interactive construction (with Cinderella).
the lines through DE and F are:
Choose...
both line segments
parallel
perpendicular
unrelated
the lines MN and KL are:
Choose...
both line segments
parallel
perpendicular
unrelated
the lines through GH and C are:
Choose...
both line segments
parallel
perpendicular
unrelated