Question

Define chord and arc

Answer 1

A chord of a circle is a straight line segment whose endpoints both lie on the circle.

An arc is a portion of the circumference of a circle. 

Answer 2

ARC : a part of a curve, especially a part of the circumference of a circle.
CHORD : A line segment connecting two points on a curve. Example: the line segment connecting two points on a circle's circumference is a chord. When the chord passes through the center of a circle it is called the diameter.
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