Question

The foot of a ladder leaning against a wall of length 5 metres rests on a level ground 5√3 metres from the base of the wall. The angle of inclination of the ladder with the ground is 

(a) 60° 

(b) 50° 

(c) 40° 

(d) 30°

Answer 1

(d) 30°

tan θ = \(\frac{AB}{BC}=\frac{5}{5\sqrt3}=\frac{1}{\sqrt3}\)

∴ θ = 30°