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Exercise 9.1. Question 6

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Exercise 9.1. Question 6

    • Posted by Krish Chandna 5 years, 4 months ago

    CBSE > Class 10 > Mathematics
    • 1 answers

    Yogita Ingle 5 years, 4 months ago

    A 1.5 m tall boy is standing at some distance from a 30 m tall building. The angle of elevation from his eyes to the top of the building increases from  to  as he walks towards the building. Find the distance he walked towards the building.

    Ans. AB = 30 m and PR = 1.5 m

    AC = AB – BC

    = AB – PR

    = 30 – 1.5

    = 28.5 m

    In right triangle ACQ,

      QC =  m

    In right triangle ACP,

     

     

     

     

     

     PQ = 

     PQ =  =  m

    Hence, the walked towards the building is  m.

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