A sector is a portion of a geometric object determined by radii from a distinguished center. For a star convex plane region, it is bounded by two radii and the intervening part of the boundary. The special case for a disk is a circular sector, while the corresponding solid associated with a sphere is a spherical sector.
Sector
See also
Circular Sector, Spherical SectorExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Sector." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/Sector.html