Sqrt (10 + sqrt 51) = sqrt (10 + 7.14) = sqrt 17.14 = 4.14
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sqrt(40) = sqrt(4*10) = sqrt(4)*sqrt(10) = 2*sqrt(10)
sqrt(160) = sqrt(16*10) = sqrt(16)*sqrt(10) = 4*sqrt(10)
sqrt(810) = sqrt(81*10) = sqrt(81)*sqrt(10) = 9*sqrt(10)
sqrt(1440) = sqrt(144*10) = sqrt(144)*sqrt(10) = 12*sqrt(10)
Area = Length*Width so Width = Area/Length = 40/[10+sqrt(13)] = 40*[10-sqrt(13)] / [10+sqrt(13)][10-sqrt(13)]= [400 - 40*sqrt(13)] / [100 - 13]= 400/87 - 40*sqrt(13)/87= 40/87*[10 - sqrt(13)]= 2.94 approx.