The hidden rule Whiteboard exercise Play

The length of a curve – a satellite circles the Earth Whiteboard exercise Play

The reasons for using circles Animation Play

The riches hidden in the oceans Student activity Play

The riches hidden in the oceans Whiteboard exercise Play

The small and the big circles Whiteboard exercise Play

The three circles Whiteboard exercise Play

Theorems Student activity Play

Three circles Student activity Play

Three circles – finding the arcs Whiteboard exercise Play

Three circles – finding the area Whiteboard exercise Play

Two circles Whiteboard exercise Play

Two circles Simulation Play

Two circles Student activity Play

Two circles Simulation Play

Two circles Student activity Play

Two circles and a line Student activity Play

Two circles and a line Whiteboard exercise Play

Two circles externally tangent Whiteboard exercise Play

Two circles internally tangent Whiteboard exercise Play

Two internally tangent circles Whiteboard exercise Play

Which quadrant is the circle in? Student activity Play

Which quadrant is the circle in? Simulation Play