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The angle of elevation on the top of a building from the foot of a tower is 30° . The angle of elevation of the top of the tower

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The angle of elevation on the top of a building from the foot of a tower is 30° . The angle of elevation of the top of the tower when seen from the top of the second water is 60° .If the tower is 60 m high, find the height of the building.

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Let AB be thee building and PQ be the tower. 

We have,

So, the height of the building is 20 m.

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