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Assertion (A): In a circle of radius $21$ cm, an arc of length $22$ cm subtends an angle of $60^{\circ}$ at the centre.
Reason (R) : The length of arc of a sector of a circle of radius $r$ and central angle $\theta$ is $\frac{2\pi r\theta}{360}$.
Reason (R) : The length of arc of a sector of a circle of radius $r$ and central angle $\theta$ is $\frac{2\pi r\theta}{360}$.
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(A) Both, Assertion (A) and Reason (R) are true and Reason (R) is correct explanation of Assertion (A).