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A195428 Decimal expansion of normalized Philo sum, Philo(ABC,G), where G=centroid of the 7,24,25 right triangle ABC.

%I A195428 #5 Mar 30 2012 18:57:45
%S A195428 5,4,7,5,5,9,7,9,0,6,2,3,7,4,8,1,9,4,9,7,8,0,9,9,1,0,4,0,6,1,8,1,2,0,
%T A195428 6,8,9,4,1,2,4,9,9,2,3,2,7,6,0,9,9,2,1,5,8,8,6,0,5,9,9,6,3,0,0,6,9,2,
%U A195428 9,4,7,9,9,8,3,8,6,1,5,7,2,0,0,1,0,8,4,5,1,6,4,1,2,8,5,3,7,7,6,6
%N A195428 Decimal expansion of normalized Philo sum, Philo(ABC,G), where G=centroid of the 7,24,25 right triangle ABC.
%C A195428 See A195304 for definitions and a general discussion.
%e A195428 Philo(ABC,G)=0.5475597906237481949780991040618120...
%t A195428 a = 7; b = 24; h = 2 a/3; k = b/3;
%t A195428 f[t_] := (t - a)^2 + ((t - a)^2) ((a*k - b*t)/(a*h - a*t))^2
%t A195428 s = NSolve[D[f[t], t] == 0, t, 150]
%t A195428 f1 = (f[t])^(1/2) /. Part[s, 4]
%t A195428 RealDigits[%, 10, 100] (* (A) A195425 *)
%t A195428 f[t_] := (t - a)^2 + ((t - a)^2) (k/(h - t))^2
%t A195428 s = NSolve[D[f[t], t] == 0, t, 150]
%t A195428 f2 = (f[t])^(1/2) /. Part[s, 4]
%t A195428 RealDigits[%, 10, 100] (* (B) A195426 *)
%t A195428 f[t_] := (b*t/a)^2 + ((b*t/a)^2) ((a*h - a*t)/(b*t - a*k))^2
%t A195428 s = NSolve[D[f[t], t] == 0, t, 150]
%t A195428 f3 = (f[t])^(1/2) /. Part[s, 1]
%t A195428 RealDigits[%, 10, 100] (* (C) A195427 *)
%t A195428 c = Sqrt[a^2 + b^2]; (f1 + f2 + f3)/(a + b + c)
%t A195428 RealDigits[%, 10, 100] (* Philo(ABC,G) A195428 *)
%Y A195428 Cf. A195304.
%K A195428 nonn,cons
%O A195428 0,1
%A A195428 _Clark Kimberling_, Sep 18 2011