OFFSET
0,1
EXAMPLE
arclength = 0.9246753483536079599958842623846196965880723284650...
MATHEMATICA
s = Integrate[Sqrt[1 + D[Sec[x], x]^2], {x, 0, Pi/4}]
r = N[s, 200]
RealDigits[r][[1]]
CROSSREFS
KEYWORD
AUTHOR
Clark Kimberling, Jun 15 2020
STATUS
approved