In fact, from the similar parallelogramms DEHK and GAHI one has x/b = (x-a)/(b-y), x = DK and y = IK being the coordinates of I with respect to the lines DJ, DE, parallel to AC and AB respectively. It follows that x*y = a*b. The calculation above defines c through a*b = cē/4. The rest and the construction procedure results from the discussion in HyperbolaWRAsymptotics.html .

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