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An arc is just part of the circumference of a circle.
In geometry, an arc is a curved portion of a circle. It is defined by two endpoints and the points along the circumference of the circle that lie between the endpoints. The measure of an arc is typically given in degrees.
The value of pi is the circumference of a circle divided by its diameter
A chord is a straight line that extends from one point of the circumference of a circle to another point on the circumference and the diameter of a circle is its largest chord
A tangent is a straight line that touches the circumference of a circle at a given point