The perpendicular bisector in a circle Animation Play

The perpendicular bisector of a line segment Animation Play

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

The potential energy of a system composed of several objects Student activity Play

The potential energy of a system composed of several objects Simulation Play

The potential energy of a system composed of several objects Whiteboard exercise Play

The potential energy of a system composed of several objects Chart Play

The SAS property Animation Play

The Side-Angle-Side (SAS) property Whiteboard exercise Play

The Side-Angle-Side property Whiteboard exercise Play

The Side-Side-Side (SSS) property Whiteboard exercise Play

The Side–Angle–Side (SAS) property – observations and generalisation Student activity Play

The Side–Side–Side (SSS) property Student activity Play

The Solar System Student activity Play

The SSS property Animation Play

Triangles Whiteboard exercise Play

What are alloys? Student activity Play

What are alloys? Whiteboard exercise Play

When is a theorem false? The counterexample Student activity Play

Why objects float or sink Simulation Play

Why objects float or sink Whiteboard exercise Play

Why objects float or sink Student activity Play

Why some objects feel cold to the touch Slideshow Play

Yoko cleans her room Animation Play