Question

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What is the surface area of the cylinder? Express the answer in terms of pi.

Answer 1

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➷ The formula for surface area of a cylinder is:

$2\pi rh + 2\pi r^2$

The radius is half the diameter

radius = 8/2 = 4

Substitute the values in:

$2\pi (4)(18) + 2\pi (4)^2$

Solve it:

surface area = $176\pi$

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Answer 2

Answer:

525.64 $cm^{2}$

Step-by-step explanation:

The formula is S.A. =2$\pi r^{2} + 2\pi rh$

write the equation out. *raduis is half of diameter, d=8. r=4)

2 x 3.14 x $4^{2}$ + 2 x 3.14 x 4 x 18 = S.A.

Solve

2 x 3.14 x 4^2 = 100.48

Rewrite

100.48 + 2 x 3.14 x 4 x 18 = S.A.

solve second halve

2 x 3.14 x 4 x 18 = 452.16

rewrite

100.48 + 425.16 = 525.64

525.64 $cm^{2}$

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