Case Study Question 04


Chapter 9: Some Applications of Trigonometry

Class 10

A boy is standing on the top of light house. He observed that boat P and boat Q are approaching to light house from opposite directions. He finds that angle of depression of boat P is 450 and angle of depression of boat Q is 300. He also knows that height of the light house
is 100m.
Based on the above information, answer the following questions.

Lighthouse and boats

What is the length of CD?

What is the length of BD?

  • 100√3 m

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