$A$ ladder rests against a wall so that its top touches the roof of the house. If the ladder makes an angle of $60^{\circ}$ with the horizontal and the height of the house is $6\sqrt{3} \text{ m}$,then the length of the ladder is ..... $m$.

  • A
    $12\sqrt{3}$
  • B
    $12$
  • C
    $12/\sqrt{3}$
  • D
    None of these

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