Parallel Lines

Videos without Words


Croatian version 


Thanks to Rex Boggs, Rockhampton Grammar School, Australia
( for help with the English translation.




Drawing and Naming Parallel Lines (using a triangle and ruler)

How do you draw parallel lines and parallel line segments on the paper?
What is the symbol for "is parallel to"?
What is the symbol for "is not parallel to"?
Find the answers in this video.


Constructing Parallel Lines (using a straightedge and compass)

Did you know that we can draw parallel lines using just a straightedge and a compass (without a set square)? In that case, we say that we construct parallel lines.
To learn how to do it, watch this video.
1st part of the video:
For given line a we construct line b which is parallel to the line a.
2nd part:
For given line c and external point T, we construct line d which goes through point T and is parallel to line c.


Drawing Parallel Lines in GeoGebra

In this video you can see how to draw parallel lines and parallel line segments in GeoGebra (GGB) and how to write that they are parallel.