## Chord

### In mathematics, a chord is a line segment that connects two points on the circumference of a circle

In mathematics, a chord is a line segment that connects two points on the circumference of a circle. The two points are called the endpoints of the chord.

Here are a few key features and properties of chords:

1. Length: The length of a chord can vary depending on its position on the circle and the distance between its endpoints. The length can be calculated using the formula for the distance between two points in the coordinate plane if the coordinates of the endpoints are known.

2. Diameter: A chord that passes through the center of the circle is called a diameter. The diameter is the longest chord in a circle and it bisects the circle into two equal halves. The length of the diameter can be found by multiplying the radius of the circle by 2.

3. Perpendicular Bisector: The chord that passes through the center of a circle is also the perpendicular bisector of the diameter. This means that it divides the diameter into two equal halves, perpendicular to each other.

4. Arc and Chord Relationship: The chord divides the circle into two arcs, and the length of the chord is related to the lengths of these arcs. Specifically, if a diameter is drawn perpendicular to a chord, it will bisect the chord and the arcs on each side of the chord will be equal in length.

5. Central Angle and Chord Relationship: The measure of the central angle formed by two radii drawn to the endpoints of a chord is equal to twice the measure of the angle formed by the chord and the tangent line drawn to the circle at one of the endpoints of the chord.

Understanding these properties and relationships can help in solving various problems related to chords in geometry and trigonometry.

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