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A flag staff on the top of the tower 80 ...

A flag staff on the top of the tower 80 mt of height subtends an angle `Tan^-1 (1//9)` at a point on the ground 100 mt from the foot of the tower. The height of the flag staff is

A

20 m

B

30 m

C

40 m

D

25 m

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The correct Answer is:
A
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