Central Angle of Annulus Sector is the angle whose apex (vertex) is the center of the concentric circles of Annulus and whose legs (sides) are radii intersecting the circles in four distinct points. And is denoted by ∠Central(Sector). Central Angle of Annulus Sector is usually measured using the Degree for Angle. Note that the value of Central Angle of Annulus Sector is always positive. Typically, the value of Central Angle of Annulus Sector lies in the range from 0 to 360.