$A$ 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$12/\sqrt{3}$
- DNone of these
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