Use your mouse to move the red and green parts of this disc. Can
you make images which show the turnings described?
Can you sort these triangles into three different families and explain how you did it?
How many different triangles can you draw on the dotty grid which each have one dot in the middle?
How much do you have to turn these dials by in order to unlock the
Can you describe the journey to each of the six places on these
maps? How would you turn at each junction?
The triangles in these sets are similar - can you work out the
lengths of the sides which have question marks?
Watch this film carefully. Can you find a general rule for
explaining when the dot will be this same distance from the
We had some very detailed solutions to this problem - well done!
Go to last month's problems to see more solutions.
Bernard Bagnall describes how to get more out of some favourite
How good are you at estimating angles?