There are lots of different methods to find out what the shapes are worth - how many can you find?
Some students have been working out the number of strands needed for different sizes of cable. Can you make sense of their solutions?
Here is a Sudoku with a difference! Use information about lowest common multiples to help you solve it.
If I tell you two sides of a right-angled triangle, you can easily work out the third. But what if the angle between the two sides is not a right angle?
Try to solve this very difficult problem and then study our two suggested solutions. How would you use your knowledge to try to solve variants on the original problem?
Investigate constructible images which contain rational areas.
These proofs are wrong. Can you see why?