An equilateral triangle inscribed in a rectangle. What is its area X in terms of triangle areas A and B?

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## Solution

The area X=2√(A^{2}+AB+B^{2}).

## Poem

The cowbell in Switzerland

And this bell hanging on their neck

And flowers on their head

A wonderful sound

This aesthetically chimes

Accompagnying the transhumance of the nomadic herd

Such wonderful carillons

They clang in unisson

With the rythmic mouvements

As they walk