Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ameryn.love17

Find the surface area of a cylinder with a base diameter of 8ft and a height of 9ft . Write your answer in terms of , and be sure to include the correct unit.

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. ameryn.love17
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1330128011662:dw|

    • 2 years ago
  2. jryaaaan18
    Best Response
    You've already chosen the best response.
    Medals 0

    find the area of the circle forming the top of the cylinder, then multiply it by your height to give you the volume

    • 2 years ago
  3. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 0

    pi*16*9

    • 2 years ago
  4. bahrom7893
    Best Response
    You've already chosen the best response.
    Medals 0

    144pi(ft^3)

    • 2 years ago
  5. virtu
    Best Response
    You've already chosen the best response.
    Medals 3

    The best way to visualize this problem is by taking a piece of paper and rolling it up to look like a cylinder. You will have a hollow cylinder, but we can fix that in the problem. We have two circles and one rectangle This will give us the surface area. First we will compute the area of a single circle the area of a circle is defined as pi*r^2=a the diameter (d) of a circle is 2*radius (r) d=2r therefore d/2=r d=8 8/2=4=r pi*4^2=area of a single circle but we have two circles (one on top and one on bottom) 2(pi*4^2)=area of two circles We now need to find the area of the edges. This is where the paper will come in to handy. Take a sheet of paper and roll it up in a circle. You'll notice that you now have a cylinder. The area of the paper = length*width. Our given length is 9 we need to find our width. In order to do that we have to find a relationship between the square and the circles. The length of the circle's edge is the width that we are looking for. So we need to find the circumeference. the circumference of a circle (our width) is = 2*pi*r 2*pi*4=width width*height = area of sides of cylinder=area of a square rolled up area1 = 2(pi*4^2)=100.53 area 2 = (2*pi*4)*9 = 226.1946710584651 area1+area2= 326.7256359733385ft^2

    • 2 years ago
  6. ameryn.love17
    Best Response
    You've already chosen the best response.
    Medals 0

    whoa!!!

    • 2 years ago
  7. ameryn.love17
    Best Response
    You've already chosen the best response.
    Medals 0

    lol not to sound stupid but wheres the answer

    • 2 years ago
  8. virtu
    Best Response
    You've already chosen the best response.
    Medals 3

    bottom

    • 2 years ago
  9. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 0

    That

    • 2 years ago
  10. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 0

    is

    • 2 years ago
  11. saifoo.khan
    Best Response
    You've already chosen the best response.
    Medals 0

    HUGE.

    • 2 years ago
  12. ameryn.love17
    Best Response
    You've already chosen the best response.
    Medals 0

    it is

    • 2 years ago
  13. virtu
    Best Response
    You've already chosen the best response.
    Medals 3

    Does it help?

    • 2 years ago
  14. ameryn.love17
    Best Response
    You've already chosen the best response.
    Medals 0

    im trying it out

    • 2 years ago
  15. Chlorophyll
    Best Response
    You've already chosen the best response.
    Medals 0

    SA = 2 pi r^2 + 2 pi r h = 2 pi r ( r + h) = 2 pi 4 ( 4 + 9) = 326.6 ft^2

    • 2 years ago
  16. Chlorophyll
    Best Response
    You've already chosen the best response.
    Medals 0

    Any comment, ameryn?

    • 2 years ago
    • Attachments:

See more questions >>>

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.