algebra

the surface area of a cylinder with a radius of 21 cm and a height of 42 cm. Use 22/7 for pi
.

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  1. Surface area = 2 (22/7) r^2 + 2 (22/7) r h.

    Insert values and solve.

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    posted by PsyDAG
  2. SA = 2(pi * r^2) + 2(pi * h)

    SA = 2[(22/7 * 21^2)] + 2[(22/7) * 42)]

    http://math.about.com/od/formulas/ss/surfaceareavol_3.htm

  3. SA = 2(pi * r^2) + 2(pi * r * h)

    SA = 2[(22/7 * 21^2)] + 2[(22/7) * 21 * 42)]

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