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

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

The nth term for a geometric sequence Student activity Play

The perimeter of the triangle and the diameter of the big circle Animation Play

The Rational Root Theorem – proof Animation Play

The rule for the sum of a convergent geometric series Whiteboard exercise Play

The rule for the sum of a convergent geometric series Student activity Play

The sum of a convergent geometric series – applications in geometry Student activity Play

The sum of a convergent geometric series – squares Whiteboard exercise Play

The sum of a convergent geometric series – triangles Whiteboard exercise Play

The sum of a finite geometric series Animation Play

The sum of a finite geometric series Student activity Play

The sum of a finite geometric series – activity Whiteboard exercise Play

The sum of a finite geometric series – problems Student activity Play

The sum of a finite geometric series – problems Whiteboard exercise Play

The sum of a finite geometric series – problems Whiteboard exercise Play

The sum of a positive number and its reciprocal Animation Play

The sum of infinite geometric series Whiteboard exercise Play

The sum of the angles in a polygon Student activity Play

The sum of the exterior angles of a convex polygon Student activity Play

The sum of the interior angles of a quadrilateral – proof Animation Play

Theorems and their assumptions in algebra Student activity Play

Theorems and their assumptions in algebra Whiteboard exercise Play

Theorems and their assumptions in geometry Student activity Play

The  nth term rule for the geometric sequence Whiteboard exercise Play