Chord of circle

The chord of a circle is any line segment whose endpoints are on the circle.

Chords of a circle

A diameter is also a chord. However, a chord is not necessarily a diameter.  If the chord goes through the center of the circle, it is called a diameter.  

The circle above has 3 chords. The green chord is a diameter since it goes through the center. However, the two black chords are not diameters.

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