# 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)]

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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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