A243597 -id:A243597 - cp's OEIS frontend

A243596 Decimal expansion of the solid angle in steradians (sr) subtended by a cone with the polar angle of 1 radian (rad).

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

Offset: 1

Stanislav Sykora, Jun 07 2014

Given a right circular cone with polar angle theta, the solid angle it subtends is 2*Pi(1-cos(theta)). Not to be confused with the area, in steradians, of a spherical square with the side theta (see A231986).

			2.8883657975136401375431217405500923198415259929590102...

Stanislav Sykora, Table of n, a(n) for n = 1..2000
Wikipedia, Solid angle
Wikipedia, Steradian
Wikipedia, Cone

Cf. A231986, A243597 (fraction of full solid angle).

RealDigits[2 Pi (1 - Cos[1]), 10, 111][[1]] (* Robert G. Wilson v, Jun 12 2014 *)

PARI
```
2*Pi*(1-cos(1))
```

2*Pi*(1-cos(1)) = 4*Pi*A243597.

cp's OEIS Frontend

A243596 Decimal expansion of the solid angle in steradians (sr) subtended by a cone with the polar angle of 1 radian (rad).

Views

Author

Keywords

Comments

Examples

Links

Crossrefs

Programs

Mathematica

PARI

Formula