The first tangent theorem – perpendicularity Whiteboard exercise Play

The first tangent theorem – perpendicularity Student activity Play

The graphs that are constant functions Whiteboard exercise Play

The H-R diagram Whiteboard exercise Play

The H-R diagram Student activity Play

The H-R diagram Animation Play

The H-R diagram Whiteboard exercise Play

The H-R diagram Student activity Play

The H-R diagram Illustration Play

The length of a metal rod Animation Play

The masses of the stars Student activity Play

The missing numbers Whiteboard exercise Play

The missing numbers in the rectangles Whiteboard exercise Play

The number of car accidents Animation Play

The numbers in the rectangles Animation Play

The numbers in the rectangles Animation Play

The numbers on the diagram Whiteboard exercise Play

The operation of a heat engine Student activity Play

The operation of a heat engine Illustration Play

The operation of a rectifier Animation Play

The operation of a rectifier Animation Play

The origin and 'something' Student activity Play

The percentage of a number presented on the diagram Whiteboard exercise Play

The range Student activity Play

The relationship between the two diagrams Simulation Play