Thursday, January 27, 2011

Homework Book Page 52-55

Questions: #2 on page 54, #4 on page 55 & #6 on page 55.

2) I was asked to find the surface area of this.
A)
My solution is :


lxw= a
3.2x11.5= 36.8cm²
3.2x11.5= 36.8cm²
5x11.5=57.5cm²
5x11.5=57.5cm²
5x3.2=16cm²
5x3.2=16cm²

TSA= (36.8X2)+(57.5X2)+(16X2)
TSA=220.6cm²

B)

My solution:
lxw=a
4.5x10.4=46.8 cm²
4.5x10.4=46.8 cm²
12x10.4=124.8 cm²
12x10.4=124.8 cm²
12x4.5=54 cm²
12x4.5=54 cm²

TSA=(46.8x2)+(124.8x2)+(54x2)
TSA= 451.2 cm²

4) Ty is painting this storage bench for the deck. How much area does he need to paint, to the nearest hundredth of a square meter?

My solution:
lxw=a
0.5x1.56=0.78m²
0.5x1.56=0.78m²
0.38x1.56=0.5928m²
0.38x1.56=0.5928m²
0.5x0.38=0.19m²
0.5x0.38=0.19m²

TSA=(0.78X2)+(0.5928X2)+(0.19x2)
TSA=3.1256m²

6) A)Calculate the amount of material hey need to make a new cover.


My solution:
TSA= 2.992+2.992+0.88+0.88
TSA= 7.744m²

B) Waterproof material at the Fabric Warehouse is on sale this week for $24.95 per square metre. Calculate the cost to make he new cover.

Solution:
7.774 X 24.95= 193.96
The cost to make a new cover is $193.96.

VIDEOS!:)



LINKS:


What is a surface area?

What is the total surface of a triangular prism?
*Please tell me if a mistake was made.
* Photos aren't as clear as always. The camera I'm using often isn't available to use.
___________________________
VOLUME PROBLEMS

r=d/2 The maximum volume is 3.925m³
r=0.5/2
r=0.25m

V=π.r.r.h
V= 3.14 x 0.25 x O.25 x 20
V=0.19625m² x 20m
V=3.925m³
____________________
CYLINDER VOLUME

r=d/2 r=d/2
r=1/2 r=0.8/2
r=0.5m r=0.4m

V=π.r.r.h V=π.r.r.h
V=3.14x0.5 x0.5 x 10 V=3.14x0.4 x0.4 x 10
V=0.785m²x 10m V=0.5024m²x 10
V= 7.85m³ V=5.024

7.85m³-5.024m³=2.826m³ The required concrete is 2.826m³ or 2.8m³


VOLUME VIDEO! ENJOY!:)

12 comments:

  1. FANTASTIC JOB KATHRYN! Your scribe is perfect! You included pictures of your own work, videos, links, Flisti survey, and you used colors and bolded font to emphasize important details. Nothing negative to say. Keep it up :)

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  2. Great job Kathryn! ever thing in your post is very well done, and I really like how its very organized. The videos were very useful and you explained everything very well with pictures and writing!

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  3. Good job. I liked how everything was well organized and easy to understand. I also like the pictures you added and the videos. The font size was easy to read aswell.

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  4. Good Job Kathreeen! I liked how you added pictures,videos,links,and a flisti poll. Keep up the Goodwork!

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  5. Nice Job Katren! It was perfect! You included in videos, pictures, links, colors and all of those requirements for having a perfect scribe! You even included a poll! Nice Job!

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  6. This comment has been removed by the author.

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  7. Great Job Kathryn! Your scribe was organized and easy to read. I like how you added in pictures of your own work, and also good job on adding a video and a link to help us more. I taught you explained everything well.

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  8. Fantastic job Kathryn! I liked how you took a picture of the question first then added the answers after. Also, I liked how you put a couple of videos, links, and 2 Flisti questions. You're scribe is very organized, and you explained everything well.

    ReplyDelete
  9. Good job Kathryn. I liked that you added pictures. I also liked how you added videos too. Good job.

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  10. Great job, Kathryn! I liked how you included EVERYTHING, and also a Flisti. No improvements, keep it up!

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  11. Great job Kathryn!
    I like how you added pictures, colour, two videos, three links, and two Flisti's! Every thing looks good to me, so keep it up!

    ReplyDelete
  12. Good job Kathryn! I liked how you have everything in your scribe! It is really neat & organized! Keep it up!

    ReplyDelete