Mathematics for IGCSE & O level - Vectors (Section 5 - No. 21)
If AB = CD and CD = EF, what is the relationship between AB and EF?
AB = EF
AB is parallel to EF.
AB = -EF
AB is perpendicular to EF.
Explication
Transitivity of the vectors, if AB = CD and CD = EF, then AB = EF.