given an equilateral triangle $ABC$ how to dissect it so we can rearrange it into a square . we can cut it into a rectangle and then we can find the side length of the square with $GM$ theorem. is there any other ways
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1A quick Google search found this – Daniel Mathias May 17 '20 at 15:05
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2This is Dudeney's Haberdasher's problem: https://math.stackexchange.com/questions/3163167/dudeney-s-solutions-to-haberdashers-problem-exact-measures-of-sections/3163845#3163845 – Intelligenti pauca May 17 '20 at 16:20