A319881 Decimal expansion of the steradian solid angle subtended by one triangular facet of the icosidodecahedron.

1, 7, 9, 8, 5, 3, 4, 9, 9, 7, 9, 2, 4, 7, 8, 2, 7, 0, 5, 8, 8, 5, 5, 2, 9, 9, 7, 2, 5, 6, 1, 0, 8, 2, 3, 6, 0, 1, 2, 9, 7, 3, 5, 3, 6, 8, 2, 9, 1, 9, 2, 1, 1, 9, 0, 5, 4, 6, 7, 3, 0, 2, 9, 9, 9, 3, 3, 1, 4, 6, 1, 0, 6, 4, 5, 8, 7, 9, 3, 8

Offset: 0

Author

Bradley Klee, Sep 30 2018

Keywords

• nonn
• cons

Examples

			0.17985349979247827058855299725610823601297353682919...
		

Links

• Eric Weisstein's World of Mathematics, Icosidodecahedron
• Eric Weisstein's World of Mathematics, Spherical Polygon

Crossrefs

Cf. A319883. Cuboctahedron: A236555, A236556.

Programs

Mathematica

RealDigits[3*ArcTan[2] - Pi, 10, 80][[1]]

PARI

3*atan(2)-Pi \\ Altug Alkan, Oct 03 2018

Formula

Equals 3*arctan(2) - Pi.

Equals (Pi - 3*A319883)/5.