In angle of elevation of a cloud from a point 60m above lake is 30° and angle of depression of the reflection of a cloud in the lake is 60°.find the height of the cloud from the surface of lake?
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Height of the cloud from the surface of the cloud is 120 m.
Given
To find height of the cloud from the surface of lake.
From the figure, AO be the height "h" of the cloud.
AO = h
Where, CD = OB = 60 m.
EB = AB = AO + OB
= 60 + h -----> ( 1 )
From the figure,
In Δ AOD,
tan 30° = AO / OD
1 / = h / OD ( tan 30° = 1 / ; AO = h )
OD = h × -----> ( 2 )
In Δ EOD,
tan 60° = OE / OD
= ( OB + BE ) / OD
× OD = OB + BE
Using equation ( 2 ), OD = h ×
OB = 60
BE = 60 +h
× h × = 60 + 60 + h
3 h = 120 + h
3 h - h = 120
2 h = 120
h = 60
Height of the cloud "h" is 60 m.
Height of the cloud from the surface of the cloud = AB + BE = 60 + 60 = 120.
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