Angles Formed by Parallel Lines Cut by a Transversal
In the applet below, AB || CH (line AB is parallel to line CH). Line DE is a transversal. There are 8 angles formed at the intersections of the lines - do you see them?
- Drag point A or B to change the location & direction of both parallel lines.
- Drag point D or E to change the location & direction of the transversal.
- Which angles are always the same size?
- Which angles are always supplementary (add up to 180°)?