The length of an arc of a circle refers to the product of the central angle and the radius of the circle.
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That will depend on the length of the arc but an arc radian of a circle is about 57.3 degrees
It is part of the circumference of a circle
If the circumference of the circle is 32 cm, the length of the arc that is 1/4 of the circle is: 8 cm
It will be 1/3 of the circle's circumference
you will need to know the angle subtended by the arc; arc length = radius x angle in radians