A ladder rests against a wall so that it...

A ladder rests against a wall so that its top touches the roof of the house. If the ladder makes an angle of `60^(@)` with the horizontal, and height of the house be `6sqrt(3)`m then the length of the ladder is

`12sqrt(3)m`

`3sqrt(3)m`

`12/(sqrt(3))m`

`12m`

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