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%I #11 Jun 23 2018 12:17:58
%S 2,9,7,5,4,7,1,7,1,6,5,8,4,4,0,1,6,2,9,2,7,2,4,2,1,8,5,7,7,7,2,2,5,0,
%T 3,1,0,7,9,1,2,3,5,0,2,6,6,0,9,1,3,9,4,6,4,7,9,9,6,8,6,7,3,2,5,1,0,6,
%U 6,9,5,8,9,6,8,1,0,6,2,4,0,7,6,6,5,7,4,9,4,3,9,6,6,1,4,3,9,9,6,3,3,5,6,1,8
%N Decimal expansion of the surface area of a unit Reuleaux triangle.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ReuleauxTetrahedron.html">Reuleaux Tetrahedron</a>
%F 8*Pi - 18*arccos(1/3).
%e 2.9754717165844016292...
%t RealDigits[8*Pi - 18*ArcCos[1/3], 10, 100][[1]]
%K nonn,cons
%O 1,1
%A _Eric W. Weisstein_, Dec 19 2011
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