## Monday, January 31, 2011

### Math Test Answers # 2 and 4

Hey Guys :)

Here are the answers for numbers 2 and 4 from our Math Test today.

* I didn't have time to copy the actual picture from our test because I was quite rushing*

1)

So, we were asked to find the Total Surface Area of the given Triangular Prism.

2)

For this number, we were asked to find the Total Surface Area for the given Rectangular Prism.
If you still had problems with finding the T.S.A of a Rectangular or Triangular Prism, here are some links and videos to help you out!
Videos!

If you spot any mistakes, fell free to tell me!

Cylinder Volume and Volume Problems

Chapter 7.3

Formula used : V = pi .r.r.h

a ) v = pi.r.r.h
= 3.14 ( 5.5.23)
= 3.14 ( 575)
= 1805.5 cm3

b) V = pi.r.r.h
= 3.14 ( 14.14.12)
= 3.14( 2352)
= 7385.28 cm 3

c) V = pi.r.r.h
=3.14 ( 0.5.0.5. 1.5)
=3.14 (0.375)
=1.1775 m3

Chapter 7.4

I first tried to find out the volume of the First cylinder,
R= diameter divided by 2
=10 divided by 2
= 5cm 2

V = pi.r.r.h
=3.14 (5.5.30)
=3.14 (750)
=2355 cm 2

I then tried to find out the volume of the Second cylinder without the height

Volume= 2335 cm2
height = pi.r.r
=3.14 (4.4)
=3.14 (16)
=50.24 cm2

I then divided the volume of the 2 cylinders to get the height for the second cylinder,
2335 divided by 50.24
= 46.9 cm3

Video Post

1. Great job, Trish! I liked how your pictures were neat, and also you included everything in your post! No mistakes, but maybe make the video smaller? If it was possible. Keep it up!

2. Great job Trish!
I like how you added pictures, colour, two videos, and three links! Every thing looks good to me, so keep it up!

3. Good Job Trish! I liked how your pictures are clear so we can see how you did your work. I also like how you added links and video. Keep up the Goodwork!

4. Good job Trish! I like how you have many pictures, videos, links & colors! Also, your work is easy to understand! keep it up!

5. GREAT JOB TRISH! I liked how you showed your work by adding pictures. Also, I liked how you added more than one links and videos. You're post is very easy to understand and well organized. There's nothing negative about your post. Keep it up!(:

6. GREAT JOB TRISH! I liked the way you included everything! Your scribe has pictures of your own work, videos,links, and it's organized and neat. Next time, you may want to add Flisti survey to make your blog even better. Other than that, fantastic job and keep it up!

7. Great Job Trish! I like how you added a picture of your own work, and explaining it. Also great job on posting a videos and a links to help us more. Your post is very organized and easy to read. Keep it up.