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Question:

If a tower 30m high causes a shadow 10√3 long on the ground, then what is the angle of elevation of the sun?

Solution:

Let AB be the tower and BC be its shadow on the ground and θ is the angle of elevation.
⇒tanθ = AB/BC = 30/10√3 = √3
⇒θ = 60°
The angle of elevation of the sun is 60°.