Lovely proof. Some more....https://www.zmescience.com/science/math/10-beautiful-visual-mathematical-proofs-elegance-and-simplicity/ …
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And Roger B. Nelsen's excellent 3 books 'Proofs Without Words'
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Area of a square inscribed in a circular segment is 1/25 area of a square inscribed in a circlepic.twitter.com/Q38a5oCHIM
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A little simpler to observe that 5² + 5² = 7² + 1² = 50 Forgive the crude illustrationpic.twitter.com/d1g7E0ZcSX
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was a bit difficult to count the 3x1 triangles in the big square, but very good!
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I totally get this.
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It reminds me of the Vitruvian man.
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