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Yes, as long as you know the angle of the arc (between the two radii at its ends at the centre of the arc):

arc_length = radius x angle_of_arc_in_radians

→ radius = arc_length ÷ angle_of_arc_in_radians

To convert between degrees and radians:

radians = π x degrees ÷ 180°

→ degrees = 180° x radians ÷ π

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Q: Can you use arc length to find radius?
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