The two sides and an angle between them Whiteboard exercise Play

The value of an algebraic expression Student activity Play

The values of the trigonometric functions Animation Play

The work that needs to be done to pull a barrel up Whiteboard exercise Play

Theorem – assumptions and claim Whiteboard exercise Play

Theorem – assumptions and claim Student activity Play

Theorems and their assumptions in geometry Student activity Play

Three circles – finding the arcs Whiteboard exercise Play

Three circles – finding the area Whiteboard exercise Play

Time of flight for projectile motion at an angle Whiteboard exercise Play

Time of flight for projectile motion at an angle Student activity Play

Total internal reflection Simulation Play

Total internal reflection Student activity Play

Transform a triangle into a rectangle Simulation Play

Transform a triangle into a rectangle Student activity Play

Transformation of a triangle Animation Play

Transformations Student activity Play

Triangle Animation Play

Triangles Class activity Play

Triangles Whiteboard presentation Play

Triangles in LOGO Student activity Play

Triangles – part I Student activity Play

Trigonal bipyramidal and octahedral geometry Animation Play

Trigonometric functions Student activity Play

Trigonometric functions Student activity Play