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%I #13 Oct 01 2022 22:37:08
%S 2,8,0,2,8,4,7,3,4,5,6,9,3,5,1,0,8,5,7,7,5,5,1,7,8,5,2,8,3,8,9,1,0,5,
%T 5,5,6,1,7,4,3,5,0,9,8,6,8,8,9,8,6,1,9,5,3,8,2,4,3,6,1,2,7,5,7,6,6,9,
%U 2,4,8,3,8,4,8,9,4,1,7,6,4,7,6,4,8,3,7,0,9,5,7,0,2,4,8,7,3,5,0,4
%N Decimal expansion of -1/8 + 4/Pi^2.
%C Probability that a triangle picked at random in a unit disk is acute.
%D Clifford A. Pickover, The Math Book, From Pythagoras to the 57th Dimension, 250 Milestones in the History of Mathematics, Sterling Publ., NY, 2009, page 476.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/DiskTrianglePicking.html">Disk Triangle Picking</a>
%H <a href="/index/Tra#transcendental">Index entries for transcendental numbers</a>
%e 0.280284734...
%t RealDigits[ 4/Pi^2 - 1/8, 10, 105][[1]]
%o (PARI) 4/Pi^2 - 1/8 \\ _Charles R Greathouse IV_, Oct 01 2022
%K nonn,cons
%O 0,1
%A _Eric W. Weisstein_, Apr 01 2004
%E a(99) corrected by _Georg Fischer_, Apr 04 2020
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