The elevation at the top of a building under construction at a point 120 m from the base is 45∘ How much higher should the building be raised so that the elevation becomes 60∘?
120√3m
120(√3−1)m
120(√3+1)m
100 m
A
120(√3+1)m
B
100 m
C
120√3m
D
120(√3−1)m
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