The energy levels of hydrogen atom Student activity 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 the circle with centre at an arbitrary point Whiteboard exercise Play

The exact values Whiteboard exercise Play

The first tangent theorem – perpendicularity Student activity Play

The focal length and the shape of a lens Animation Play

The focal point of a concave mirror Student activity 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 Whiteboard exercise Play

The future of the Universe Student activity Play

The hexagon and the square Whiteboard exercise Play

The length of an arc Student activity Play

The length of an arc – finding the angle Whiteboard exercise Play

The length of the arc Whiteboard exercise Play

The length of the Earth's radius Whiteboard exercise Play

The line and the circle Student activity Play

The perimeter of the triangle and the diameter of the big circle Animation Play

The period of the tangent Student activity Play

The periods of the sine and the cosine Student activity Play

The perpendicular bisector of a line segment – a reminder Student activity Play

The perpendicular bisectors Simulation Play

The properties of orbits Animation Play