At a point on level ground, the angle of elevation of a vertical tower
is found to be such that its tangent is . On walking 192 metres
towards the tower, the tangent of the angle of elevation is . Find
the height of the tower.
The horizontal distance between two towers is 140 m. The angle of elevation of the top of the first tower when seen from the top of the second tower is 30°. The height of the second tower is 60 m find the height of the first tower.
Asked by Topperlearning User | 30th Nov, 2013, 02:13: AM
Let AB be the tower of height h metres. Let AD=x metres, CD=192 metres.
tanα = , tanβ =
tanα = = ……………………. (i)
tanβ = = or x= ……………………… (ii)
Using (ii) in (i)
2880 +20h =36h
16h = 2880 or h= 180
Hence, the height of the tower is 180 metres.
Let AB and CD be two towers of height h m and 60 m respectively.
AC=140m and ÐBDE =300.
tan 30° =
BE == 80.83m
Thus, the height of the first tower is
AB= AE+BE = CD+BE =60+80.83 = 140.83m
Answered by | 30th Nov, 2013, 04:13: AM
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