## Wednesday, February 2, 2011

### Cylinder Homework

r= d/2
r=7/2
r=3.5cm

=2 .π. r. r+ 2.π.r.h
=2. 3.14 . 3.5 . 3.5+2 . 3.14 . 3.5 . 7
= 76.93 + 153.86
= 230.79cm 2

r=d/2
r=15/2
r=7.5cm

=2 .π. r. r+ 2.π.r.h
=2 . 3.14 . 7.5 . 7.5 + 2 . 3.14 . 7.5 . 18
=353.25 + 847.8
=1201.05cm 2

=2 .π. r. r+ 2.π.r.h
=2 . 3.14 . 6.5 . 6.5 + 2 . 3.14 . 6.5 . 20
=265.33 + 816.4
=1081.73cm 2

r= d/2
r=8/2
r=4m

v=( r x r) x h
v=(3.14 x 4 x 4) x 10v=50.24m 2 x 10
v= 502.4m 3

502.4/2
=251.2m 3

Then you subtract the volume of the smaller cylinder to the bigger cylinder which will give you the amount of concrete needed for the culvert.

Concrete= 5.024m 3 - 7.85m 3
Concrete= 2.826m 3

1. Good job Ryan! I liked how you have a video, pictures, link, and information. Also, your scribe is neat & organized. Keep it up!

2. Good job Ryan! I liked how you added pictures showing your own work. Also, I liked how you added a link and a video. Your scribe is well organized. Next time, you might want to add links to games and colors. Keep it up!(:

3. GREAT JOB RYAN! Your scribe is organized. I liked the way you included a video, link, and pictures. Next time, try to take a picture of your own work instead of using paint. Keep it up!

4. Great Job Ryan! I liked how you added in links, pictures of your work and a video. However, you could've added colors or gaming sites about cylinder to your scribe to make it better. Keep it up!

5. Good Job Ryan! I liked how you added a link,video,pictures and how you did it. I clicked on your link it doesn't work :P Next time put links to gaming sites like what they said. Anyways keep up the goodwork!

6. Good job ryaan, next time you should add color. I liked how you added pictures of the work, the formulas, videos, and a link. keep it up!

7. Great Job Ryan! I like how you added in a picture and explaining it. Also great on adding a video and link to help us more, your post is organized and easy to read. Keep it up!

8. Great job Ryan! I like your the way you have described the work. Your post is well organized. Keep up the great effort and work!

9. Great job Ryan! It looks simple and easy to read. The link, video, and images were helpful. Keep up the great work!

10. Great job Ryan! I like how the drawings were clear. The video,link and images were helpful.Keep it up!

11. Gwed job Ryan! Very organized scribe. Keep it up! Though your numbers in your pictures look kinda funny. ;p