6. Exemplar - Find the radius

A piece of wire \(18 \ cm\) long is bent into the form of an arc of a circle subtending an angle of \(60^\circ\) at its centre. Calculate the radius of the circle.
 
The radius of the circle \(=\)
\(cm\)
Answer variants:
22.18
26.18
20.18
17.18
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