Length of the arc

What is the length of the arc of a circle k (S, r=68mm), which belongs to a central angle of 78°?

Correct result:

x =  92.5723 mm


r=68 mm o=2π r=2 3.1416 68427.2566 mm  x=78360 o=78360 427.2566=92.5723 mm

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