found in the collection of problems (enigmes) set at
henri barnier college in Marseilles
make this regular hexagon into a rectangle by cutting and fitting:
a few other dissections:
what are the angles in these shapes and what relationships exist for the side lengths?
there's a Geogebra thingy, showing how the cuts can be varied with a slider:
how is this dissection formed?
see also: Busschop's dissection