Fascinating Dissection

First, print and cut the pieces below. Then, arrange them so that they form a triangle and then rearrange them so that they form a square.

SOLUTION

The solution is shown below.

What is fascinating about these dissections is that one can transform into the other by keeping the pieces attached to each other in a chain and simply rotating them around the hinge points.

Henry Dudeney

Henry Ernest Dudeney (1857 – 1930) was an English author and mathematician who specialized in logic puzzles and mathematical games. He is known as one of the country's foremost creators of mathematical puzzles.

Henry Dudeney

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