A319883 Decimal expansion of the steradian solid angle subtended by one pentagonal facet of the icosidodecahedron.

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

Offset: 0

Author

Bradley Klee, Sep 30 2018

Keywords

• nonn
• cons

Examples

			0.74744171820913396183995946566632056804410057174304...
		

Links

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

Crossrefs

Cf. A319881. Cuboctahedron: A236555, A236556.

Programs

Mathematica

RealDigits[2*Pi - 5*ArcTan[2], 10, 80][[1]]

Formula

Equals 2*Pi - 5*arctan(2).

Equals (Pi - 5*A319881)/3.