The angle of elevation of the top of a tower from point at a distance of 100 metres from its foot on a horizontal plane is found to be 60∘. Find the height of the tower
173.2m
196m
144m
123.2m
A
123.2m
B
173.2m
C
196m
D
144m
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Solution
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Let the height of the tower AC be h metres Given distance BC = 100 m, ∠ABC=60∘ ∴tan60∘=ACBC=h100⇒h=100×tan60∘=(100×√3)metre =100×1.732=173.2m
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The angle of elevation of the top of a tower from point at a distance of 100 metres from its foot on a horizontal plane is found to be 60∘. Find the height of the tower
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