From a point A on the ground , the angle...

From a point A on the ground , the angles of elevation of the top of a 10 m tall building and a helicopter hovering at some height of the building are `30^(@) and 60^(@)` respectively. Find the height of the helicopter above the building

`(10)/(sqrt(3))m`

`10sqrt(3)m`

`(30)/(sqrt(3m))m`

`30m`

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