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A195479 Decimal expansion of shortest length, (A), of segment from side AB through centroid to side AC in right triangle ABC with sidelengths (a,b,c)=(2,sqrt(5),3).

%I A195479 #5 Mar 30 2012 18:57:47
%S A195479 1,2,4,4,0,6,2,1,5,6,7,5,4,7,3,6,9,8,9,2,5,4,6,9,2,9,7,6,1,3,4,4,1,4,
%T A195479 4,0,6,9,0,1,1,4,2,6,7,9,8,3,5,1,2,6,3,8,8,2,6,0,1,5,8,3,0,3,1,7,0,7,
%U A195479 6,7,2,1,2,4,1,2,7,3,4,6,1,2,0,3,4,7,1,6,2,2,1,5,0,0,5,1,5,8,2,5
%N A195479 Decimal expansion of shortest length, (A), of segment from side AB through centroid to side AC in right triangle ABC with sidelengths (a,b,c)=(2,sqrt(5),3).
%C A195479 See A195304 for definitions and a general discussion.
%e A195479 (A)=1.24406215675473698925469297613441440690...
%t A195479 a = 2; b = Sqrt[5]; h = 2 a/3; k = b/3;
%t A195479 f[t_] := (t - a)^2 + ((t - a)^2) ((a*k - b*t)/(a*h - a*t))^2
%t A195479 s = NSolve[D[f[t], t] == 0, t, 150]
%t A195479 f1 = (f[t])^(1/2) /. Part[s, 4]
%t A195479 RealDigits[%, 10, 100] (* (A) A195479 *)
%t A195479 f[t_] := (t - a)^2 + ((t - a)^2) (k/(h - t))^2
%t A195479 s = NSolve[D[f[t], t] == 0, t, 150]
%t A195479 f2 = (f[t])^(1/2) /. Part[s, 4]
%t A195479 RealDigits[%, 10, 100] (* (B) A195480 *)
%t A195479 f[t_] := (b*t/a)^2 + ((b*t/a)^2) ((a*h - a*t)/(b*t - a*k))^2
%t A195479 s = NSolve[D[f[t], t] == 0, t, 150]
%t A195479 f3 = (f[t])^(1/2) /. Part[s, 1]
%t A195479 RealDigits[%, 10, 100] (* (C) A195481 *)
%t A195479 c = Sqrt[a^2 + b^2]; (f1 + f2 + f3)/(a + b + c)
%t A195479 RealDigits[%, 10, 100] (* Philo(ABC,G) A195482 *)
%Y A195479 Cf. A195304, A195480, A195481, A195482.
%K A195479 nonn,cons
%O A195479 1,2
%A A195479 _Clark Kimberling_, Sep 19 2011