Quick links:► downloadable teaching materials for lines & planes in space (vectors)► syllabus content for the Vectors Topic: HL syllabus (see syllabus section 4.7 ).A significant difference between the syllabus content for the Vectors topic in SL and HL is that planes are not included in SL. Lines in 2D and 3D are in both SL and HL. However, in SL only the vector equation of a line is considered; whereas in HL students...