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20/360=arc length/2pi*50; 1/12=arc length/100pi. 100pi/12=arc length. arc length=25pi/3 centimeters, which is approximately 26.17993878 centimeters.
It will be 1/3 of the circle's circumference
That will depend on the length of the arc but an arc radian of a circle is about 57.3 degrees
An arc length of 120 degrees is 1/3 of the circumference of a circle
The length of arc ACB is 57.2.