OFFSET
0,1
COMMENTS
Also distance from the diameter of unit semicircle to its centroid. - Franck Maminirina Ramaharo, Oct 22 2018
LINKS
J. Sondow, The parbelos, a parabolic analog of the arbelos, arXiv 2012, Amer. Math. Monthly 120 (2013) 929-935.
E. Tsukerman, Solution of Sondow's problem: a synthetic proof of the tangency property of the parbelos, arXiv 2012.
EXAMPLE
0.424413181578387562050356702326704965425225721974550529993779...
MATHEMATICA
RealDigits[4/(3 Pi), 10, 100]
PROG
(PARI) 4/Pi/3 \\ Charles R Greathouse IV, Oct 01 2022
CROSSREFS
KEYWORD
AUTHOR
Jonathan Sondow, Nov 28 2013
STATUS
approved