Cylinder Height

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A cylinder has surface area of 402 cm2. The height is three times greater than the radius.
What is the height of the cylinder?

  • Cylinder Height -

    r = radius
    3r = height (h)
    SA = 2(pi)(r)(h) + 2(pi)(r^2)
    SA = 2(pi)(r)(3r) + 2(pi)(r^2)
    SA = 6(pi)(r^2) + 2(pi)(r^2)
    SA = 8(pi)r^2

    402 = 8(pi)r^2
    402 = 8(3.14)r^2
    402 = 25.12r^2
    16.00318 = r^2
    rounding 16.00318 = 16
    16 = r^2
    r = 4

    height = 3r = 3(4) = 12

  • Cylinder Height -

    thx

  • math -

    a bowling ball measures 264cm in circumference. What is the volume of the smallest cube that will hold this ball?

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