PROBLEM
– 13
The angle of elevation of the top of an unfinished tower at a point distance 80 m from its base is 30 degrees. How much higher must the tower be raised so that its angle of elevation at the same point may be 60 degrees.
The angle of elevation of the top of an unfinished tower at a point distance 80 m from its base is 30 degrees. How much higher must the tower be raised so that its angle of elevation at the same point may be 60 degrees.
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