A circle segment is an area of a circle informally defined as an area which is "cut off" from the rest of the circle by a secant or a chord. The circle segment constitutes the part between the secant and an arc, excluding the circle's center.
A closed interval corresponding to a finite portion of an infinite line is known as a Line Segment. Line segments are generally labeled with two letters corresponding to their endpoints, say A and B, and then written AB.
The segment of the circle is the region bounded by a chord and the arc subtended by the chord. Finding the circle segment area is very similar to working with the area of a sector.
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