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Q: 

Calculate arc length / central angle of circle using Gesture Recognizers

I need to rotate a circle by an amount equal to the distance travelled by the users finger... This would equate to the length of the arc moved by the finger... I know the radius of the circle, but need to calculate the central angle and maybe the arc length.

Can i do this using any functions in PanGestureRecognizer? translationInView? locationInView? previousLocationInView?

Thanks

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