An image formed by a concave mirror Animation Play

An object brought closer to the focal point Animation Play

An object brought closer to the mirror Animation Play

Angle bisector Student activity Play

Angles around a point Whiteboard exercise Play

Angles around a point Student activity Play

Angles in a circle Student activity Play

Angles in a circle Whiteboard exercise Play

Angles on a straight line and angles round a point Student activity Play

Arbitrary denominator Whiteboard exercise Play

Arbitrary denominators Student activity Play

Arbitrary shapes bounded by straight lines Whiteboard exercise Play

Arbitrary shapes bounded by straight lines Student activity Play

Arbitrary transformations Animation Play

Arbitrary translations of graphs of polynomials Student activity Play

Arbitrary translations of graphs of polynomials Whiteboard exercise Play

Area between the graph of an arbitrary function and the x-axis Whiteboard exercise Play

Area between the graph of an arbitrary function and the x-axis Student activity Play

Area between the graphs of two arbitrary functions Whiteboard exercise Play

Area between the graphs of two arbitrary functions Student activity Play

Area under enlargement – a heptagon Whiteboard exercise Play

Areas of images of figures under enlargement Student activity Play

Arithmetic mean Animation Play

Arithmetic mean – 'balancing point' of the data Student activity Play

Arithmetic mean – 'balancing point' of the data Whiteboard exercise Play