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Explanation:
the full arc of a circle (360°) is its circumference
2pi×r
a part arc defined by a central angle is then
2pi×r × angle/360
in our case
2pi×17 × 40/360 = 2pi×17 × 1/9 = pi×34/9 in
the arc is
34/9 × pi in
in terms of pi : 34/9
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