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There are 4 jugs which hold 9 litres, 7 litres, 4 litres and 2 litres. Find a way to pour 9 litres of drink from one jug to another until you are left with exactly 3 litres in three of the jugs.

What can you say about the lengths of the sides of a quadrilateral whose vertices are on a unit circle?

The problem is how did Archimedes calculate the lengths of the sides of the polygons which needed him to be able to calculate square roots?

What fractions can you divide the diagonal of a square into by simple folding?

A picture is made by joining five small quadrilaterals together to make a large quadrilateral. Is it possible to draw a similar picture if all the small quadrilaterals are cyclic?

In this question we push the pH formula to its theoretical limits.

Can you rotate a curve to make a volume of 1?