Transformation from an equilateral triangle to a square, resp. to a pentagon

Left:
Wooden equilateral triangle cut into 4 pieces which can be rearranged into a square.
Wellknownn as Dudeney’s Dissection.

Right:
Wooden equilateral triangle cut into 6 pieces which can be rearranged into a regular Pentagon.
Wellknown as Goldbegr’s Dissection.

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