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A pole 10 m high stands on a tower 30 m....

A pole 10 m high stands on a tower 30 m. high. The angle of elevation of the top of the pole at a point A on the ground in `45^(@)` and the pole subtends an angle `alpha` at the same point A then `alpha` is equal to (with each side equal to 100 m.)

A

`cot^(-1) (1//7)`

B

`cot^(-1) 7`

C

`cos^(-1) (1//7)`

D

`sin^(-1) (1//7)`

Text Solution

Verified by Experts

The correct Answer is:
B
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