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AB = total height
AD = height of flagstack
BD = height of tower
BC = 9m
Now, in right triangle ABC
AB/BC = TAN 60
AB/9 = √3
AB = 1.73 × 9= 15.57 m
Also in right triangle BDC
BD/BC = TAN 30
BD/9 = 1/√3
BD = 9×1/1.73
BD = 5.2m
SO
AD = AB-BD= 15.57-5.2 = 10.37m
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