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Increasing (or decreasing) a block size
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06-25-2014, 08:27 AM
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ghostrider
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Join Date: Jan 2009
Posts: 4,688
The doubling is of the square formed by the diagonals of the four inset squares. Socrates explained it best.
http://www.cut-the-knot.org/proofs/half_sq.shtml
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