The area of a triangle Class activity Play

The area of a triangle Whiteboard presentation Play

The area of a triangle Animation Play

The area of a triangle circumscribed about a circle Animation Play

The blue rings Whiteboard exercise Play

The centre and the radius Animation Play

The centre and the radius of a circle Student activity Play

The centre and the radius of a circle Simulation Play

The centre of a circle Animation Play

The circle Simulation Play

The circle Whiteboard presentation Play

The circle Class activity Play

The circle and its equation Animation Play

The circle and the equilateral triangle Student activity Play

The circle and the equilateral triangle Whiteboard exercise Play

The circle and the oval Animation Play

The circle as a locus Animation Play

The circle inscribed in a square Whiteboard exercise Play

The circle with centre at an arbitrary point Whiteboard exercise Play

The circle with centre at the origin Student activity Play

The circle with centre at the origin Whiteboard exercise Play

The circle's circumference Whiteboard exercise Play

The circle's circumference and its diameter Student activity Play

The circle's diameter Whiteboard exercise Play

The circumcentre of a triangle Student activity Play