A 20 metre long stair is standing against a wall making an angle of 60degrees from the ground Find t...........

Quantitative Aptitiude (CLAT) MCQ practise

A 20 metre long stair is standing against a wall making an angle of 60degrees from the ground. Find the distance between the foot of the stair and wall.

10m

17.32 m

34.64 m

30m

Explanation:

To find the distance between the foot of the stair and the wall we can cosine formula which is = adjacent side/hypotenuse.
Here the adjacent side is the distance between the foot of the wall and the stairs. The hypotenuse is the length of the stairs.
Cos ?? = x / 20
1 / 2 = x / 20
Therefore distance X = 10 m