An observer on a cliff top 57 m high observes a ship at sea. The angle of depression to the ship is 15°. The ship sails towards the cliff, and the angle of depression is then 25°. How far, to the nearest metre, did the ship sail between sightings?
Oops.... I made a slight error
It should be
(57/tan15 - 57/tan25) = about 90.49m
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the answer is meant to be 91 m but i dont get how? can someone expain it to me please. thanks