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This regular hexagon has been divided into four trapezia and one hexagon. If each of the five sections has the same perimeter, what is the ratio of the lengths $p$, $q$ and $r$?
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
If it takes four men one day to build a wall, how long does it take 60,000 men to build a similar wall?
If the sides of the triangle in the diagram are 3, 4 and 5, what is the area of the shaded square?