Two internally tangent circles Whiteboard exercise Play

Two parallel tangents to a circle Whiteboard exercise Play

Types of gas changes Student activity Play

Undefined gradient Animation Play

Unknown angle in a triangle Animation Play

Using mean bond enthalpies in calculations. Part 1 Student activity Play

Using tangent theorems Student activity Play

Using tangent theorems Whiteboard exercise Play

Using the calculator Whiteboard exercise Play

Using the calculator Student activity Play

Using the diagrams in real life Whiteboard exercise Play

Using the difference identity for the tangent Whiteboard exercise Play

Using the double-angle formulas for the tangent to rewrite cosine Whiteboard exercise Play

Using the double-angle formulas for the tangent to rewrite sine and cosine Student activity Play

Using the tangent Student activity Play

Using the tangent Animation Play

Using the tangent to find the zero of a function Whiteboard exercise Play

Values of the tangent Animation Play

Water and ice at equilibrium Animation Play

Water solutions of sulphuric acid and sulphurous acid Whiteboard exercise Play

Weight Class activity Play

What affects refraction? Simulation Play

What affects refraction? Student activity Play

What affects refraction? Whiteboard exercise Play

What is the radius? Whiteboard exercise Play