The sum of the angles in the triangle Animation Play

The tangents to the circle that are parallel to the line Animation Play

Total current Animation Play

Total resistance Simulation Play

Total resistance Whiteboard exercise Play

Total resistance Student activity Play

Total resistance in a parallel circuit Whiteboard exercise Play

Total resistance in a parallel circuit Student activity Play

Transformations Class activity Play

Transformations Whiteboard presentation Play

Trapezium Student activity Play

Trapezium Whiteboard exercise Play

Triangle Student activity Play

Triangle Whiteboard exercise Play

Two mirrors Animation Play

Two parallel faces in the cuboid Whiteboard exercise Play

Two parallel symmetry lines Animation Play

Two parallel tangents to a circle Whiteboard exercise Play

Two reflections in two parallel mirror lines Whiteboard exercise Play

Vector equations of lines in 2-D Whiteboard presentation Play

Voltage in series connection Simulation Play

What type of connection is it? Student activity Play

What type of connection is it? Whiteboard exercise Play

Where do Harry, Yoko, Emmanuel and Lena live? Whiteboard exercise Play

Where do Harry, Yoko, Emmanuel and Lena live? Student activity Play