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From the top of a lighthouse 75 m high, the angle of depression of a ship is 45°. The distance of the ship from the foot of the lighthouse, in metres, is:

Competition practiceTrigonometry
  • A75√3
  • B25√3
  • C150
  • D75

Step-by-Step Solution

The angle of elevation from the ship equals 45°, so tan45° = 75/d gives d = 75 metres.
Answer: D) 75

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