The diagram represents the above problem, with PQ as tower and X any Y as points.
Also, XY = 40 m implies RP = 40 m
QR + RP = QP
QR = QP - RP = (QP - 40) m
[FROM 2 AND YR = XP]
XP = 20(1.73) = 34.6 m
i.e. distance of tower from the point X is 34.6 m
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