<P> A circular sector or circle sector (symbol: ⌔), is the portion of a disk enclosed by two radii and an arc, where the smaller area is known as the minor sector and the larger being the major sector . In the diagram, θ is the central angle in radians, r (\ displaystyle r) the radius of the circle, and L (\ displaystyle L) is the arc length of the minor sector . </P> <P> A sector with the central angle of 180 ° is called a half - disk and is bounded by a diameter and a semicircle . Sectors with other central angles are sometimes given special names, these include quadrants (90 °), sextants (60 °) and octants (45 °), which come from the sector being one 4th or 6th or 8th part of a full circle, respectively . </P>

What is a sector of a circle definition