$\overline{ OA }$ and $\overline{ OB }$ are radii of a circle perpendicular to each other. If $OA =5.6\, cm .$ then the area of the minor sector formed by those radii is .......... $cm ^{2}$.

  • A

    $24.64$

  • B

    $15.68$

  • C

    $8.96$

  • D

    $17.92$

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