An arc is a portion of the circumference of a circle.
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An arc is a portion of the circumference
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 perimeter of a circle is its circumference
The round perimeter of circle is its circumference
The perimeter of a circle is its circumference