Multiple Choice Questions on The angle of elevation of the top of a building at a point G on the ground is 45 degrees On walking ........... for CDS Exam Preparation

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Multiple Choice Questions

The angle of elevation of the top of a building at a point G on the ground is 45 degrees On walking ...........

Quantitative Aptitude (CDS) Height and Distance
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    The angle of elevation of the top of a building at a point G on the ground is 45 degrees.On walking 20m forwards the building the angle of elevation becomes 60 degrees.The height of the building is equal to?

    60√3(1+√3) m

    Incorrect Answer

    30√3(1-√3) m

    Incorrect Answer

    30√3(1+√3) m

    Correct Answer

    40√3(1+√3) m

    Incorrect Answer
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    Explanation:

    Let  base point distance is x metre and height h

     tan45 °=h/x

    h=x

    tan 60 °=h/x+60

    √3= h/x+60

    √3 x+60√3=h

    √3  h +60√3 =h   putting the value of x=h

     h=60√3/1-√3

    h=30√3(1+√3) m    taking magnitude value

    By: bhavesh kumar singh
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