2/a = (11-d)/(d*5sqrt(5)), a^2 = 125+(11-d)^2-10*sqrt(5)*(11-d)*11/(5sqrt(5))2/a = (11-d)/(d*5sqrt(5)), a^2 = 125+(11-d)^2-10*sqrt(5)*(11-d)*11/(5sqrt(5))

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