chord
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A chord is a straight line segment that connects two points on a curve, such as a circle. Chords are useful in geometry and mathematics because they help us understand the properties and relationships within curved shapes.
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Common lines and line segments on a circle, including a chord in blue
A chord (from the Latin chorda, meaning "catgut or string") of a circle is a straight line segment whose endpoints both lie on a circular arc. If a chord were to be extended infinitely on both directions into a line, the object is a secant line. The perpendicular line passing through the chord's midpoint is called sagitta (Latin for "arrow").