Answer :


Let us take AB as a building, with AB = 7 m
and CE as a cable tower
Angle of elevation from top of tree to top of cable tower∠EAD = 60°,
and angle of depression from the top of the building to the bottom of the tower is, ∠CAD = 45°
Also, 
∠CAD = ∠ACB  [Alternate angles]

Clearly, 
AB = DC and EC = ED + DC ?

In Δ ABC:


where p = perpendicular and b = base, therefore

AB = BC = 7 m

In Δ EDA,

However,

The height of tower can be calculated as:

EC = ED + DC

= 7√3 + 7

= 7(√3 +1) m

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