It is the circle's diameter that is the biggest chord.
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The chord that passes through the centre is the biggest chord in a circle and it is the diameter.
A chord is any line segment going from one side of the circle to another. A diameter is a special chord - it is a chord that goes through the center of the circle. It is also the biggest chord possible in the circle. So all diameters are chords, but not all chords are diameters
The largest chord of a circle is its diameter
If radius of a circle intersects a chord then it bisects the chord only if radius is perpendicular to the chord.
A chord line intersects a circle at two points of which the circle's diameter is its largest chord.