Question

The upper (3/4)th portion of a vertical pole subtends an angle tan^-1 (3/5) at a point in the horizontal plane through its foot and at a distance 40 m from the foot. A possible height of the vertical pole is 

(a) 20 m (b) 40 m (c) 60 m (d) 80 m

Answer 1

The correct option is (b) 40 m.

Explanation:

Here, from the figure we see that

Hence, height of the vertical pole is 40 m.