Question

there are two poles one each on either Bank of a river just opposite to each other one Pole is 60 M height from the top of this Pole the angle of depression of the top and foot of the Other pole or 30 degree and 60 degree respectively find the width of the river and height of the Other pole

Answer 1

The total width of the road is given by

W = w1 + w2

where w1 = l.sin(alpha), and w2 = l.cos(alpha)

and l = 30 m and alpha = 32.4 degrees.

So, w1 = 30*sin(32.4) = 16.075 m, and w2 = 30*cos(32.4) = 25.330 m

Giving W = w1 + w2 = 41.405 m