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A cylindrical solid whose radius and height are equal has a surface area of 154cm2.Calculate its radius?

  • Math -

    surface are = 2 end circles + "sleeve" of cylinder

    2πr^2 + 2πrh = 154 , where r is the radius and h is the height
    but h = r
    2πr^2 + 2πr^2 = 154
    r^2 = 77/π
    r = √(77/π)
    = .....

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