3. TBQ - length of the arc

The radius of the circle \(=\) 3.9 \(cm\)
 
The central angle of the sector, \(\theta\) \(=\) 10\(^\circ\)
 
\(\pi\) \(=\) \(3.14\)
 
The length of the arc of the sector \(=\)
Answer variants:
\(-1.42\) \(cm\)
\(2.58\) \(cm\)
\(0.68\) \(cm\)
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