OFFSET
1,3
EXAMPLE
arclength = 1.05809550139256305772788939193594688774...
MATHEMATICA
r = NIntegrate[Sqrt[1 + Cos[t]^2], {t, 0, Pi/4}, WorkingPrecision -> 200]
RealDigits[r][[1]]
CROSSREFS
KEYWORD
nonn,cons
AUTHOR
Clark Kimberling, Jul 01 2020
STATUS
approved