If Flash animation/interactivity is no longer working for you, you might like to try the geoboards found here.
There are many activities that make use of a pinboard or geoboard. By using the controls at the bottom of the interactivity you can change the number of points around the circle - or select a geoboard with a central pin - or create a square pinboard.
Click on the colour bands, then drag the band you create onto the board. To attach them you will need to pull them over the pegs. To change their position - or remove them - "loop" them off each peg in turn.
The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the
NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to
embed rich mathematical tasks into everyday classroom practice.