OFFSET
0,1
COMMENTS
Torsional rigidity constant for a half-disk shaped shaft.
EXAMPLE
0.29755678205973393308...
MATHEMATICA
RealDigits[-4/Pi+Pi/2, 10, 120][[1]] (* Harvey P. Dale, May 02 2012 *)
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Eric W. Weisstein, Aug 26 2010
STATUS
approved