Thank you for the opportunity to help you with your question!
ratio of the arc length to the circumference is equal to the ratio of
the arc measure to 360 degrees. Let y denote the arc measure. We have
4.189 / 2r*pi = y/ 360
189 / 6*pi = y/ 360
y= 360*4.189 / 6*3.14= 80
The answer is D.
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