Demonstration of the formula for the area of a triangle Whiteboard exercise Play

Diagonals and sides of polygons Whiteboard exercise Play

Diagonals of polygons Student activity Play

Different angles Student activity Play

Diffraction and interference of mechanical waves Class activity Play

Diffraction and interference of mechanical waves Class activity Play

Diffraction and interference of mechanical waves Whiteboard presentation Play

Distance formula in 3-dimensional space Student activity Play

Dividing an n-sided polygon into triangles Animation Play

Dividing into a given ratio Student activity Play

Dividing the polygon into triangles Whiteboard exercise Play

Drawing a parallelogram Whiteboard exercise Play

Drawing a parallelogram and calculating its area Whiteboard exercise Play

Drawing prisms Student activity Play

Drawing the tangent Animation Play

Elements of a pyramid Student activity Play

Elements of a pyramid Whiteboard exercise Play

Enlargement – the basic property Student activity Play

Enlarging the right-angled triangle – the basic property Simulation Play

Enlarging the square – the basic property Simulation Play

Equally likely outcomes Student activity Play

Estimation of the volume Animation Play

Examples of 3-D shapes Animation Play

Examples of 3-D shapes Student activity Play

Figures made up from four strips Animation Play