Correct Answer: Option A
Let AB be the observer and CD be the tower.
Draw BE^CD.
Then, CE = AB = 1.6 m,
BE = AC = 20√3 m.
DE/ BE = tan 30º = 1/√3
=> DE = 20√3/√3m = 20 m.
So, CD = CE+DE = (1.6+20) m = 21.6 m.
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