Parallel lines – part I Student activity Play

Parallel lines – part II Student activity Play

Parallel straight lines Animation Play

Perpendicular lines Animation Play

Perpendicular lines Whiteboard exercise Play

Perpendicular lines Whiteboard exercise Play

Perpendicular lines Whiteboard exercise Play

Perpendicular lines Student activity Play

Perpendicular lines Student activity Play

Perpendicular straight lines Animation Play

Points equidistant from lines Animation Play

Problems involving properties of angles and parallel lines Whiteboard presentation Play

Problems involving properties of angles and parallel lines Class activity Play

Proportions in crossing lines cut by two parallel lines Whiteboard exercise Play

Proportions in crossing lines cut by two parallel lines Student activity Play

Reflection symmetry in the coordinate system in the lines x = a and y = b Student activity Play

Reflection symmetry in the vertical and horizontal lines Whiteboard exercise Play

Right hand rule Animation Play

Skew lines Student activity Play

Straight lines and half-planes Whiteboard exercise Play

Straight lines and half-planes Chart Play

Straight lines and half-planes Student activity Play

Symmetries with respect to parallel lines Student activity Play

Symmetries with respect to parallel lines Whiteboard exercise Play

Symmetries with respect to two perpendicular lines Student activity Play