From a point in the cricket ground, the angle of elevation of a vertical tower is found to be θ at a distance of 200m from the tower. On walking 125 m towards the tower the angle of elevation becomes 2θ. Find the height of tower.

Hi, 

In the triangle ABD, tanθ=hx+125also tan2θ= hx2tanθ1-tan2θ=hx2hx+1251-2hx+1252= hxNow try to simplify this for your own practice to get the answer. 
Regards

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