Questions
As seen from the top of fort of height a'' meters the angle of depression of the upper and the lower end of a lamp post are and respectively. The height of the lamp post is
detailed solution
Correct option is C
tanβ=ax⇒x=acotβ, tanα=a−hx⇒x=a−hcotαacotβ=a−hcotα⇒h=acotα−cotβcotα=a.sinβ−acosα.sinβTalk to our academic expert!
Similar Questions
The angle of elevation of top of an unfinished tower at a point distance 120m from its base is 450. How much height must the tower be raise so that angle of elevation of top at the same point to be 600.
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