On level ground, the angle of elevation of the top of a tower is 30o. When the observer moves 2 metr….

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On level ground, the angle of elevation of the top of a tower is 30^o. When the observer moves 2 metres closer to the tower, the angle of elevation becomes 60^o. The height (in metres) of the tower is

Options :-

1. 20√3  
2. 1√3  
3. 10(√3 - 1)  
4. √3  

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