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Given that
Distance between from base of tree to tower = B = Unknown
Angle of depression (∠α) = 30°
Angle of elevation = Angle of depression
Angle of elevation = ∠α
Angle of elevation = 30°
Now from trigonometric relation
tan @ = H|B
tan 30 = 30|B
[tex]\sqrt[1]{3}[/tex] = 30|B
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