It is a straight line within a circle that touches two points of the circumference and the largest chord is the circle's diameter.
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It is a chord of a circle.
a chord is a line between two points on the circle the radius is a line from the center to the circle
If a line segment touches two points on the circle it is called as: 1. secant; if the line extends outside the circle. 2. chord; if the line is present only within the circle. Diameter is a line which satisfies the second condition hence it is a chord. The additional condition for a chord to be known as diameter is that the chord should pass through the center of the circle!
It is a straight line that spans the circumference of a circle whereas the circle's diameter is its largest chord.
Any line that touches two points of the circumference is a chord the largest being the circle's diameter.