For all parallel lines, the following statement is true:
Corresponding angles formed by a transversal intersecting the parallel lines are equal.
In addition to this, there are other key properties related to parallel lines, including:
- Alternate interior angles are equal.
- Alternate exterior angles are equal.
- Same-side interior angles are supplementary (add up to 180 degrees).
These properties are fundamental in geometry when dealing with parallel lines and transversals.