Direct current circuit Class activity Play

Dividing an equilateral triangle Animation Play

Dividing an equilateral triangle into nine congruent triangles Whiteboard exercise Play

Dividing an n-sided polygon into triangles Animation Play

Dividing the polygon into triangles Whiteboard exercise Play

Do you remember what a polygon is? Student activity Play

Does the triangle exist? Whiteboard exercise Play

Doilies in the shape of polygons Whiteboard exercise Play

Drawing a triangle symmetrical to a point Student activity Play

Drawing a triangle symmetrical to a point Whiteboard exercise Play

Drawing an equilateral triangle Animation Play

Drawing an equilateral triangle inscribed in a circle Student activity Play

Drawing an equilateral triangle inscribed in a circle Whiteboard exercise Play

Drawing simple shapes using ITC Whiteboard presentation Play

Drawing simple shapes using ITC Class activity Play

Drawing symmetrical triangles Animation Play

Drawing the tangent Animation Play

Economics and Darwin's theory Student activity Play

Electrical resistance Whiteboard presentation Play

Electrical resistance Class activity Play

Electromotive force Whiteboard presentation Play

Electromotive force Class activity Play

Energy spectrum of a black body Student activity Play

Energy spectrum of a black body Animation Play

Enlargement with centre at point (0, 0) Animation Play