Discussion :: Height and Distance

A man standing at a point P is watching the top of a tower, which makes an angle of elevation of 30Ã‚° with the man's eye. The man walks some distance towards the tower to watch its top and the angle of the elevation becomes 60Ã‚°. What is the distance between the base of the tower and the point P?
Answer : Option D
Explanation :
One of AB, AD and CD must have given.
So, the data is inadequate.
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