The distance formula in 3-dimensional space Whiteboard exercise 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 Student activity Play

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

The field lines for two point charges Animation Play

The figures symmetric with respect to the marked point Whiteboard exercise Play

The first tangent theorem Animation Play

The first tangent theorem – perpendicularity Student activity Play

The first tangent theorem – perpendicularity Whiteboard exercise Play

The focal point of a concave mirror Simulation Play

The focal point of a concave mirror Animation Play

The focal point of a concave mirror Student activity Play

The focal point of a concave mirror Whiteboard exercise Play

The formation of an image by a spherical mirror Simulation Play

The formation of an image by a spherical mirror Whiteboard exercise Play

The formation of an image by a spherical mirror Student activity Play

The formula and the graph Student activity Play

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

The gradient and the equation of a tangent Student activity Play

The gradient of a curve at a point Whiteboard exercise Play

The gradient, the intercept and the graph Simulation Play