The length of a minor arc of a circle is given by the formula $\ldots \ldots \ldots \ldots$

  • A

    $l=\pi r$

  • B

    $l=\frac{\pi r \theta}{360}$

  • C

    $l=\frac{\pi r \theta}{180}$

  • D

    $l=\frac{\pi r^{2} \theta}{360}$

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