Question

A stack of quarters is packed in a plastic tube 4 inches tall. The diameter of each quarter is 0.94 inch.




What is the approximate surface area of the cylinder formed by the stack of coins? (Use 3.14 for .)




A.
3.76 in2



B.
13.19 in2



C.
2.77 in2



D.
18.4 in2

Answer 1

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Answer 2

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Answer 3

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Answer 4

HELLO

Answer 5

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Answer 6

@Datgirl14

Answer 7

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Answer 8

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Answer 9

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Answer 10

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Answer 11

"Posting a reply that is not relevant to the topic of discussion within that question" is against the code of conduct of open study.....

Answer 12

\[Sa=2\pi r h+2\pi r^2\]
h= 4
r=.94/2 = .47
\[sa=2\pi (.47)(4)+2\pi(.47)^2\]
\[sa=2\pi (1.88)+2\pi(.2209)\]
\[sa=3.76\pi+.4418\pi\]
\[sa=4.2018\pi\]
\[sa=4.2018\times3.14\]
\[sa=13.193652\approx13.19\]

Answer 13

You can also put the radius and height into http://www.google.com/#q=surface+area+of+a+cylinder
And it will tell you the answer is approximately 13.20 which is close to 13.19
It is 13.20 becasue 4.2018 is multiplied by 3.14159265359 but the directions say multiply it just by 3.14
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Answer 14

@Datgirl14