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'Triangles in Circles' printed from http://nrich.maths.org/
If you are having difficulty with the interactivity, you may find this helpful:
* To create a rubber band for placing on your peg board, click on the colour of band that you would like to use, in the right-hand-side table.
* A new icon will appear on the screen. Drag this rubber band over to a peg on the board. Let go.
* You can now drag the rubber band to different pegs. To create another rubber band, repeat the above.
Join each point up to the centre and look for those isosceles triangles.
There are 360 degrees in a circle, and the circle can be divided into 9 different sectors.