Hinged dissection - Wikipedia
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Geometry: Ratio of area of an equilateral triangle to the area of square - YouTube
turn a triangle into a square
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Geometry haberdasher problem - square to equilateral triangle variation - Puzzling Stack Exchange
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Square wave-to-triangle converter under Sine to Square Wave Circuits -11939- : Next.gr
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turn a triangle into a square
Animation of Dudeney's Dissection Transforming an Equilateral Triangle to a Square - Application Center
Triangle Square Inscribing -- from Wolfram MathWorld
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