The angle between the conductor and the field lines Student activity Play

The angle between the conductor and the field lines Animation Play

The angle between two lines Animation Play

The attraction of iron filings by magnets Animation Play

The bisector of a line Whiteboard exercise Play

The bisector of a line Student activity Play

The converse of the Pythagorean theorem Student activity Play

The correct perpendicular lines Whiteboard exercise Play

The direction of the Earth's rotation Whiteboard exercise Play

The family of lines Student activity Play

The family of lines Whiteboard exercise Play

The family of lines y = 2x + c Animation Play

The fence problem Student activity Play

The fence problem Whiteboard exercise Play

The field lines for two point charges Animation Play

The first tangent theorem – perpendicularity Student activity Play

The first tangent theorem – perpendicularity Whiteboard exercise Play

The general form of the equation of a straight line Student activity Play

The gradient of a line Student activity Play

The gradient of a line Whiteboard exercise Play

The gradient of a line perpendicular to the  x-axis Animation Play

The lines of symmetry Whiteboard exercise Play

The magnetic field around a conductor Whiteboard exercise Play

The magnetic field around a conductor Student activity Play

The National Grid system Whiteboard exercise Play