A380700 Decimal expansion of the acute vertex angles, in radians, in a triakis tetrahedron face.

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

Offset: 0

Author

Paolo Xausa, Jan 30 2025

Keywords

• nonn
• cons
• easy

Examples

			0.58568554345715095961775753847751776620036106717164...
		

Links

• Paolo Xausa, Table of n, a(n) for n = 0..10000
• Wikipedia, Triakis tetrahedron.

Crossrefs

Cf. A380701 (face obtuse angle).

Cf. A378204, A378205, A378206, A378207, A378208.

Programs

Mathematica

First[RealDigits[ArcCos[5/6], 10, 100]]

Formula

Equals arccos(5/6).

Equals (Pi - A380701)/2.