English: A diagram showing possible geometric reasoning for the solution to the problem on Old Babylonian tablet IM 67118 (that of finding sides a and b of a rectangle with given diagonal c and area A). Solid lines demonstrate that c^2-2A = (b-a)^2. Dashed lines and shading show how to complete the gnomon of area A to a square of area [(b+a)/2]^2. From (b-a)/2 and (b+a)/2 one can obtain b and a.
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