NationMaster - Encyclopedia: Circle segment

The geometric concept of 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. The circle segment constitutes the cut off part not containing the circle's center point.

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Circular segment - Wikipedia, the free encyclopedia (229 words)
	In geometry, a circular segment (also 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.
	Let R be the radius of the circle, c the chord length, s the arc length, h the height of the segment, and d the height of the triangular portion.
	The area of the circular segment is equal to the area of the circular sector minus the area of the triangular portion.

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	Pi is defined as the ratio of the circumference to the diameter of a circle.
	Hence seg AB is a chord of a circle.
	Secant of a circle : A line, which intersects the circumference of the circle in two distinct points, is known as the secant of a circle.

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