en.wikipedia.org/wiki/Circular_segment

In geometry, a circular segment (symbol: ⌓) is a region of a circle which is "cut off" from the rest .... The area A of the circular segment is equal to the area of the circular sector minus the area of the triangular portion—that is,. A = R 2 2 ( θ − sin ...

www.purplemath.com/modules/sectors.htm

Explains formulas for areas of sectors of circles and lengths of arcs. Demonstrates how to use the formulas in each of degrees and radians.

www.khanacademy.org/math/geometry/hs-geo-circles/hs-geo-sectors/v/area-of-a-sector-given-a-central-angle

A worked example of finding the area of a circle's sector using the area of the ... Some of the geometry section overlaps with the trigonometry section, which may ...

mathbitsnotebook.com/Geometry/Circles/CRAreaSegmentsSectors.html

MathBitsNotebook Geometry CCSS Lessons and Practice is a free site for ... When finding the area of a sector, you are actually finding a fractional part of the ...

mathworld.wolfram.com/CircularSegment.html

of the (shaded) segment is then simply given by the area of the circular sector ( the entire wedge-shaped ... so the geometric centroid of the circular segment is ...

www.mathsisfun.com/geometry/circle-sector-segment.html

Area of a Sector. You can work out the Area of a Sector by comparing its angle to the angle of a full circle. Note: we are using radians for the angles.

www.coolmath.com/reference/circles-geometry

Sector Area = circle graphic. Sector area of a circle in degrees: Sector Area = circle graphic ...

www.mathopenref.com/arcsectorarea.html

The formula used to find the area of a circlular sector - a pie-shaped part of a circle.

www.coolmath.com/reference/circles-trigonometry

Definitions and formulas for the arc and the arc length of a circle, sector and the area of the sector of a circle, the unit circle, the angles on the unit circle in ...

www.mathopenref.com/segmentarea.html

Area of a circular segment and a formula to calculate it from the central angle and radius.