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From an aeroplane vertically above a straight horizontal plane, the angle of depression of two consecutive kilo-meter stones on the opposite sides of the

aeroplane are found to be α and β. Show that the height of the aeroplanes is

tan \alpha * tan \beta / tan \alpha + tan \beta
tommorow i will do
why?? Pls do it
no time sorry i will surely tomorrow



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So from fig 

we get tan α = h/x ⇒ x = h/tan α   ......   (i)

and tan β = h/(1-x)

⇒ 1 - h/tanβ = x  ............. (ii)

using i and ii we get

 ⇒ h/tan α = 1 - h/tanβ

⇒  h{(tan α + tanβ)/tanαtanβ} = 1

⇒ h = { \frac{tan \alpha tan \beta }{(tan \alpha + tan \beta )}

2 5 2
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