Multiple Choice Questions on Find the area of a white sheet required to prepare a cone with a height of 21cm amd the radius of 20........... for Mathematics - All Exams Preparation

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Multiple Choice Questions

Find the area of a white sheet required to prepare a cone with a height of 21cm amd the radius of 20...........

Quantitative Aptitude ( CCS) Mensuration 3D
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    Find the area of a white sheet required to prepare a cone with a height of 21cm amd the radius of 20cm.

    3080 cm²

    Correct Answer

    2300 cm²

    Incorrect Answer

    3460 cm²

    Incorrect Answer

    3600 cm²

    Incorrect Answer
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    Explanation:

    Answer & Explanation
    Answer – A. 3080 cm²
    Explanation :
    r = 20 ; h = 21
    l = √(400 + 441) = 29 cm
    Total surface area = πrl + πr² = πr(l + r) = 22/7 * 20(49) = 3080 cm²

    By: MIRZA SADDAM HUSSAIN
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