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NDA2017MathematicsHeights and DistancesActual

From the top of a lighthouse, 100 m high, the angle of depression of a boat is ⁻¹ ( 5 12 ) . What is the distance between the boat and the lighthouse?

Options

  1. A120 m
  2. B180 m
  3. C240 m
  4. D360 m

Correct answer

C. 240 m

Step-by-step solution

Given, angle of depression, = ⁻¹ ( 5 12 ) aligned & = 5 12 & 100 x = 5 12 & x= 100 12 5 =240 ~m aligned

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