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Question

From a window 10 m above the ground level the tangent of angle of elevation of the top of a tower is 52 and tangent of depression of the foot of the lower is 14. Find the height of the lower.

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Solution

Let CE be the height of the tower. Let the angle of elevation of the top of the tower be α and the angle of depression of the foot of the lower be β.

tan α=52 and tan β=14 (given)

In ΔBDC

tan β=10x

14=10x

x=40 m

In Δ BDE

tan α=hx

52=h40

h=100 m

height of tower =h+10=100+10=110m


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