Stereoisomerism: geometric isomers Student activity Play

Sum of angles in a quadrilateral Animation Play

Sum of angles in quadrilaterals Student activity Play

Sum of the angles in a quadrilateral – proof Animation Play

Sum of the angles in a triangle – proof Animation Play

Sum of the consecutive terms of a geometric progression Student activity Play

Sum of the consecutive terms of a geometric progression Whiteboard exercise Play

Sum of the consecutive terms of a geometric progression Whiteboard exercise Play

Sum of the consecutive terms of a geometric progression Whiteboard exercise Play

Sums of square roots of integers Student activity Play

Sums of square roots of integers Whiteboard exercise Play

Surds – the proof Animation Play

Surds – the proof (general case) Animation Play

The area of a triangle Animation Play

The circle and the equilateral triangle Student activity Play

The complex structure of matter Animation Play

The definition of a geometric sequence Whiteboard exercise Play

The definition of a geometric sequence Student activity Play

The exterior angle of a regular polygon Student activity Play

The exterior angle of a regular polygon – proof (1) Animation Play

The exterior angle of a regular polygon – proof (2) Animation Play

The factor theorem – proof Animation Play

The inner structure of the atom Student activity Play

The Integer Root Theorem – proof Animation Play

The interior angle of a regular polygon Student activity Play