A ladder 10 m long just reaches the top of a wall and makes an angle of 60 deg with the wall Find th...........

Quantitative Aptitude ( CCS) Trignometry

A ladder 10 m long just reaches the top of a wall and makes an angle of 60° with the wall.Find the distance of the foot of the ladder from the wall (√3=1.73)

8.65 m

7.86 m

5.63 m

23.8 m

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Explanation:

Let BA be the ladder and AC be the wall as shown above.
Then the distance of the foot of the ladder from the wall = BC
Given that BA = 10 m , angleBAC = 60°
sin 60°=BC/BA
√3/2=BC/10
BC=10×√3/2=5×1.73=8.65m