## Thursday, January 27, 2011

### Hanin's Surface Area Scribe HWB 3 Q's

HWB 3 Questions

Page 54-55

These are the answers to the questions I chose. I will show my work in the end.

1. Finding the sum of all the areas of each face on a 3-D object is called surface area.

2. a) 220.6 cm

b) 451.2

3. a) 120 m

b) 140.1

Here is my work:

Cylinder Volume and Volume Problems

1) (question 12 from 7.3 in the textbook)

Jumbo
r=d/2
r=20/2
r=10cm

v=3.14xrxrxh
v=(3.14x1ox10) x40cm
v=314cm^2 X 40cm
v= 12560cm^3

Popcorn Lovers
r=d/2
r=30/2
r=15cm

v=3.14xrxrxh
v=(3.14x15x15) x20cm
v=706.5cm^2 x20cm
v=14130cm^3

Martha should buy the Popcorn Lovers container
it has more.

2) (question 7 from &.4 in the textbook)

Metre convert to centimetre:
0.25m=25cm
1m=100cm
0.4m=40cm
0.35m=35cm
1.4m=140cm

Volume of cylinder

r=d/2
r=25/2
r=12.5cm

v=3.14xrxrxh
v=(3.14x12.5x12.5) x100cm
v=490.625cm^2 x100cm
v= 49062.5cm^3

Volume of triangular prism

v=bxh/2xh
v=40x35/2 x140cm
v=700cm^2 x140cm
v=98000cm^3

98000cm^3
-49062.5cm^3
=48937.5cm^3

1. Great post Hanin, It's great you have the answers for the questions. Also how you showed your work,but it's a little.Next time you should add a video and a link.

2. Good Job, Hanin. The work's a bit confusing, so I suggest you match it up with your answers next time. Although, it's nice that you showed all your work, and left nothing out.

3. Great post Hanin. I like that you took a picture of your own work. Next time add a video and a link to make your post better. Other than that, great job.

4. Good post Hanin! Next time add a video. Other than that, good job. Keep up the good work.

5. Great JOb Hanin! I liked how you showed the whole page! It was really helpful to me! Next time maybe add a video though.

6. Nice post Hanin. It's good for you to show your work answering the questions. But next time, add a video or a link. Good job.

7. That was cool how you scanned your work. Next time show your work in a clear explanation because the picture was hard to see.

8. Good Job, Hanin! It's good and all, but next time you mght want to seperate the picture into smaller peices so we ca nsee what's going on more clearly. Tight now as it is, it can be mighty confusing for someone with bad sight. Just a heads up, but great job Hanin!