In geometry, a circular segment (symbol: ⌓) is a region of a circle which is “cut off” from the rest of the circle by a secant or a chord.

Radius of circle: R

Arc length: s

Chord: a

Central angle (in radians): x

Central angle (in degrees): α

Height of the segment: h

Perimeter: L

Area: S

- $a=2√{2hR-h^2}$
- $h=R-1/2√{4R^2-a^2}, h < R$
- $L=s+a$
- $S=1/2(sR-a(R-h))=R^2/2({απ}/{180°}-sin\ α)=R^2/2(x-sin\ x),$

S≈2/3ha

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