Multiple Choice Questions on The curved surface area of a right circular cone is 1 76 m2 and its base diameter is 140 cm What is ........... for CDS Exam Preparation

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Multiple Choice Questions

The curved surface area of a right circular cone is 1 76 m2 and its base diameter is 140 cm What is ...........

Quantitative Aptitude (CDS) Mensuration 3D
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    The curved surface area of a right circular cone is 1-76 m2 and its base diameter is 140 cm. What is the height of the cone?

     

    10 cm

    Incorrect Answer

    10\sqrt{2} \: cm

    Incorrect Answer

    20\sqrt{2} \: cm

    Incorrect Answer

    10\sqrt{15}\: cm

    Correct Answer
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    Explanation:

    πrl =1.76 * 104 cm2

    22/7 * 70*l = 1.76 * 104

    l = 80 cm

    l2 = 6400 Also, l2 = r2 +h2

    h2 = 6400 - 4900 = 1500

    h = 10 √15

    By: Munesh Kumari
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