Asked by Nancy
You need to make a soda can with a volume of 29 cubic inches.
Find the surface area. calculate the following:
a) How much material is needed if the can's radius is 2 inch?
Answer with the help of Reiny,
but doing it with a different radius
to make sure I got it.
let the height be h
volume = ðr^2h
ð(2^2)h = 29
h = ð/29
the surface area are
top + bottom + rectangle forming the outside of the cylinder
= 2ðr^2 + 2ðrh
= 2P(2) + 2ð(2)(ð/29)
= 54.13274 in^2
Since
Top = 12.56637 in^2
Bottom = 12.56637 in^2
Total surface if can radius is 2inch is: A = 54.13274 in^2
Find the surface area. calculate the following:
a) How much material is needed if the can's radius is 2 inch?
Answer with the help of Reiny,
but doing it with a different radius
to make sure I got it.
let the height be h
volume = ðr^2h
ð(2^2)h = 29
h = ð/29
the surface area are
top + bottom + rectangle forming the outside of the cylinder
= 2ðr^2 + 2ðrh
= 2P(2) + 2ð(2)(ð/29)
= 54.13274 in^2
Since
Top = 12.56637 in^2
Bottom = 12.56637 in^2
Total surface if can radius is 2inch is: A = 54.13274 in^2
Answers
Answered by
Nancy
sorry:
ð = pi
ð = pi
Answered by
Reiny
After
2πr^2 + 2πrh , if r = 2, you forgot to square the 2 in the first term, should have been
2π(4) + 2π(2)29/π)
Make the necessary changes in your calculations
(I got 26.49)
BTW, even with your error how does
2π(2) + 2π(2)(π/29) = 54.13
I had 13.93
the first term of 2πr^2 is the sum of the top and bottom, since each is a circle of πr^2 )
2πr^2 + 2πrh , if r = 2, you forgot to square the 2 in the first term, should have been
2π(4) + 2π(2)29/π)
Make the necessary changes in your calculations
(I got 26.49)
BTW, even with your error how does
2π(2) + 2π(2)(π/29) = 54.13
I had 13.93
the first term of 2πr^2 is the sum of the top and bottom, since each is a circle of πr^2 )
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.