$\overline{ OA }$ 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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