Thursday, February 17, 2011

HWB pg. 80 & 81 #4, 6, 8

4. Calculate the volume of each rectangular prism.
a) l = 15cm, w = 12cm, h = 3cm

v = l x w x h
15cm x 12cm = 180cm2
180cm2 x 3 = 540cm3


v = l x w x h
8.5m x 7m = 59.5m2
59.5m2 x 2m = 119m3


v = l x w x h
20cm x 8cm = 160cm2
160cm2 x 16cm = 2560cm3

6. Calculate the volume of each right triangular prism. Express the answer to the nearest tenth.


v = b x h1/2 x h2
7.2 x 4.5cm/2 = 16.2cm2
16.2cm2 x 10cm = 162cm3

v = b x h1/2 x h2
5 x 3/2 = 7.5cm2
7.5 x 8.5 = 63.8m3

c) A prism where the case of the triangle is 4m, the height of the triangle is 5m, and the prism height is 12m.

v = b x h1/2 x h2
4 x 5/2 = 10m2
10m2 x 12 = 120m3

8. Wab needs to buy drinks for the summer barbeque. Both containers are the same price. Which one holds more?

apple juice:
v = l x w x h
6cm x 9cm = 54cm2
54cm2 x 4.5cm = 243cm3

orange juice:
v = l x w x h
6cm x 10cm = 60cm2
60cm2 x 3.75 = 225cm3

Apple juice holds more juice (y)

Here is are links to help you out with finding out prism: 1, 2, and 3.

Here's a video:

URL of pictures:

Please tell me if I did any mistakes or what I can do better next time. (:

Cylinder Volume and Volume Problems

Chapter 7.3:

v = π r r h
v = (3.14x5cmx5xm) x 23
v = 1805.5cm3

Chapter 7.4:

Volume of cylinder: Volume of triangular prism:

r=d/2 bxh1/2 x h2
r=25/2 40x35/2 x 140cm2
r=12.5cm2 = 98000cm3

v=π r r h
v= (3.14x12.5x12.5)x100

98000cm3 - 49062.5cm3 = 48937.5cm3


* I meant to say cubed when I said squared on the part where i was supposed to say cubed :P


  1. Good job Angel! I liked how you have info/showed your work, had pictures, a video, and gave props to the owners of the pictures. Although, next time, add a link. Keep it up!

  2. Awesome job Angel! It looks well organized and neat! It really looks like you planned it out and put alot of effort into it! Keep this up and you'll be fine. Keep up the great work!

  3. Great job Angel!
    I like how you used pictures, links, a video, and colour. Next time you should put a flisti in your work. Besides that everything is alright, keep up the good work.

  4. Good Job Angel! I liked how you added all of the things and it is well organized. Keep up the Goodwork!

  5. Good job Angel IT well organized and neat. I like how you put link picture and a video. Keep it up