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circular sector
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portion of a disk enclosed by two radii and an arc
A circular sector is a slice of a circle, like a piece of pie, bounded by two straight lines (called radii) that go from the center to the edge and the curved arc between them. It's a useful shape in geometry and everyday applications because it helps us measure and calculate properties of circular portions, from pizza slices to the areas covered by rotating machinery.
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The minor sector is shaded in green while the major sector is shaded white.
A circular sector, also known as circle sector or disk sector or simply a sector (symbol: ⌔), is the portion of a disk (a closed region bounded by a circle) enclosed by two radii and an arc, with the smaller area being known as the minor sector and the larger being the major sector. In the diagram, θ is the central angle, r the radius of the circle, and L is the arc length of the minor sector.