The angles of depression of two ships from the top of a light house are 45° and 30° towards east. If the ships are 100 m apart, the height of the light house is
Here AD = h meter is the tower
The ships B and C are 100 m apart so BC = 100 m
In Δ ACD
tan 45° =
CD = h (∵ tan 45° = 1)
In Δ ABD
tan 30° =
=
h =
h= 100 + h
h = m
On rationalizing the denominator
h =
h = 50 (m