The circumference and the astonishing number Pi Student activity Play

The circumference and the astonishing number Pi Whiteboard exercise Play

The circumference of the box Animation Play

The cosine and coordinates of the points Animation Play

The cosine of an arbitrary angle Student activity Play

The distance between the centres of circles Student activity Play

The equation of a circle going through a point Student activity Play

The equation of a circle through a point Whiteboard exercise Play

The equation of a circle with centre at an arbitrary point Simulation Play

The equation of a circle with centre at an arbitrary point Student activity Play

The equation of a circle with centre at the origin Student activity Play

The equation of a tangent to a circle Student activity Play

The equation of a tangent to a circle Whiteboard exercise Play

The equation of the circle Animation Play

The equation of the circle Student activity Play

The equation of the circle with centre at an arbitrary point Whiteboard exercise Play

The equation of the tangent Student activity Play

The equation of the tangent Whiteboard exercise Play

The exact values Whiteboard exercise Play

The first tangent theorem – perpendicularity Student activity Play

The first tangent theorem – perpendicularity Whiteboard exercise Play

The four quadrants Student activity Play

The four quadrants and points of the unit circle Whiteboard exercise Play

'The greatest achievement' of Archimedes Student activity Play

The hexagon Animation Play