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  1. The angle of elevation of a ladder leaning against a house is 60° and the foot of the ladder is 6.5 metres from the house. The length of the ladder is
    1. 13
      		m
      √3
    2. 13 metres
    3. 15 metres
    4. 3.25 metres
Correct Option: B


AB = house, AC = ladder
In ∆ABC,

cos 60° =
BC
AC

⇒
1
=
6.5
2AC

⇒ AC = 2 × 6.5 = 13 metre


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