All the words in the Snowman language consist of exactly seven letters formed from the letters {s, no, wm, an). How many words are there in the Snowman language?
A small circle in a square in a big circle in a trapezium. Using the measurements and clue given, find the area of the trapezium.
By inscribing a circle in a square and then a square in a circle find an approximation to pi. By using a hexagon, can you improve on the approximation?
In how many different ways can I colour the five edges of a pentagon red, blue and green so that no two adjacent edges are the same colour?