Multiple Choice Questions on The height and the total surface area of a right circular cylinder are 4 cm and 8p sq cm respectivel........... for SSC CGL Exam Preparation

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Multiple Choice Questions

The height and the total surface area of a right circular cylinder are 4 cm and 8p sq cm respectivel...........

Quantitative Aptitude (CGL) Mensuration 3D
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    The height and the total surface area of a right circular cylinder are 4 cm and 8p sq.cm. respectively. The radius of the base of cylinder is

    (2√2 - 2) cm

    Correct Answer

    (2 - √2) cm

    Incorrect Answer

    2 cm

    Incorrect Answer

    √2 cm

    Incorrect Answer
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    Explanation:


    h=4cm
    2πr(h+r)=8πcm^2
    r(h+r)=4
    r(4+r)=4
    4r+r^2=4
    r^2+4r−4=0
    r=−4±√(16+16)/2=−4±4√2/2
    =−2±2√2
    r=(2√2–2)cm

    By: MIRZA SADDAM HUSSAIN
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