A ladder 10 m long rests against a vertical wall making an angle of 30o with the wall. How high up (in m) does it reach the wall from the ground? (Take √3 = 1.73.)
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 8.65.
According to diagram,
cos 30° = AB/AC
⇒ √3/2 = AB/10
⇒ AB = 5√3
⇒ AB = 8.65
It will reach to a height of 8.65m from the ground