It depends on what information you do have.
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The total circumference is (arc length) times (360) divided by (the angle degrees)
Find the circumference of the whole circle and then multiply that length by 95/360.
A central angle of 120 is one third of the circle, so the arc length of 28.61 is one third of the circumference. 28.61 X 3 = 85.83
length of arc/length of circumference = angle at centre/360 Rearranging the equation gives: length of arc = (angle at centre*length of circumference)/360
100/360 of the circumference of the circle = 10*pi inches