A piece of wire $20 \,cm$ long is bent into the form of an arc of a circle subtending an angle of $60^{\circ}$ at its centre. Find the radius of the circle. (in $cm$)
A piece of wire $20 \,cm$ long is bent into the form of an arc of a circle subtending an angle of $60^{\circ}$ at its centre. Find the radius of the circle. (in $cm$)
- A
$\frac{90}{\pi}$
- B
$\frac{160}{\pi}$
- C
$\frac{20}{\pi}$
- D
$\frac{60}{\pi}$
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