Question

A man standing on the top of a cliff observes a boat at an angle of depression of 45°. He then moves 30 meters further down the cliff, and the angle of depression of the boat is now 30°. How high is the cliff?

A 15(3+√3) meters
B 15(3-√3) meters
C 15√3 meters
D 15(1+√3) meters
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