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Angle of elevation of top of building is...

Angle of elevation of top of building is `30^(@)` from place A and become`45^(@)` from another place B that is 10 m from A towards the building as shown in the figure Height of building is :-

A

`(10)/(sqrt3)m`

B

`(10)/(sqrt3-1)m`

C

`10m`

D

`10sqrt3m`

Text Solution

Verified by Experts

The correct Answer is:
B

`tan 30^(@)=(h)/(h+10) =(1)/(sqrt3)`
`=sqrth =h +10`
`h=(10)/(sqrt3-1)`
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