Talk:Spherical sector

Introduction : "In geometry, a spherical sector is a portion of a sphere enclosed by two radii from the center of the sphere."

That is nonsense. A radius is a line, and two lines cannot bound a 3D surface. Perhaps : "In geometry, a spherical sector is a portion of a sphere enclosed by a circular cone with apex at the centre of the sphere.". Disambiguation also needs attention.

94.30.84.71 (talk) 15:26, 5 March 2011 (UTC)

Phi or Theta?
According to Coordinate_system in euclidean space, the angle from the pole should be noted as theta. The azimuth angle phi. If not referring to euclidean co-ordinates, the first angle referred to is conventionally theta. Perhaps theta should replace phi in the formula.Nick Hill (talk) 19:45, 18 September 2015 (UTC)

New edit
I added more context to the article, needs a lot more sources... A mathematical encyclopedia would be good start. 'M'&and;Ŝc2ħεИτlk 19:10, 31 July 2017 (UTC)

Closed and open spherical sectors
According to Mathworld, spherical sectors can be open (see figure in link). Not only is this missing on the page, it even contradicts the introduction. An open spherical sector cannot be described by a cone and a cap. 2001:A61:242B:7F00:C92E:F7CA:63B:D5DA (talk) 17:30, 1 May 2018 (UTC)