OFFSET
0,1
COMMENTS
This is the first of the three angles (in radians) of a unique triangle that is right angled and where the angles are in a Geometric Progression - pi/(2*phi^2), pi/(2*phi), pi/2. The angles (in degrees) are approx 34.377, 55.623, 90.
EXAMPLE
0.5999908074321633305578888766584034632812497527645287607337781876828268345598596...
MATHEMATICA
RealDigits[N[Pi/(2(GoldenRatio)^2), 100]][[1]]
PROG
(PARI) Pi/4*(3-sqrt(5)) \\ Charles R Greathouse IV, Jul 29 2011
CROSSREFS
KEYWORD
AUTHOR
Frank M Jackson, Aug 06 2010
EXTENSIONS
Partially edited by R. J. Mathar, Aug 07 2010
Mathematica program edited by Harvey P. Dale, Jul 10 2012
STATUS
approved