In $\odot( O , 12)$, minor $\widehat{ ACB }$ subtends an angle of measure $30$ at the centre. Then. the length of major $\widehat{A D B}$ is $\ldots \ldots \ldots . . cm .$

  • A

    $10\pi $

  • B

    $11\pi $

  • C

    $20\pi $

  • D

    $22\pi $

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