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Which is a better fit, a square peg in a round hole or a round peg in a square hole?

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A box has faces with areas 3, 12 and 25 square centimetres. What is the volume of the box?

Dividing a Square

Age 11 to 14 Short Challenge Level:
Three lines have been drawn from the centre of this square to split it into two congruent trapezia and a pentagon.



The side length of the square is 1, and the areas of the three shapes are all equal.

What is the length $x$?



This problem is adapted from the World Mathematics Championships
You can find more short problems, arranged by curriculum topic, in our short problems collection.