Volume Post

Hi! These were the answers to questions #1 and #3 on our math test today!

If the pictures above still leave you confused with surface area, check out these sites :

1. http://www.basic-mathematics.com/surface-area-of-a-rectangular-prism.html
2. http://www.aaaknow.com/geo79_x9.htm
3. http://www.shodor.org/interactivate/discussions/SurfaceAreaTriangular/

Also, here are some videos :

Feel free to make any changes or comments on my post. Okay bye :)

Cylinder Volume and Volume Problems

Answers:

Answers:

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!

Links!

-ttp://http://www.teacherschoice.com.au/maths_library/area%20and%20sa/area_9.htm

-http://http//answers.yahoo.com/question/index?qid=20080527125438AAic3Jk

-http://http//www.aaaknow.com/geo79_x9.htm

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

Volume Scribe Post

Hi! These were the answers to questions #1 and #3 on our math test today!

If the pictures above still leave you confused with surface area, check out these sites :

1. http://www.basic-mathematics.com/surface-area-of-a-rectangular-prism.html
2. http://www.aaaknow.com/geo79_x9.htm
3. http://www.shodor.org/interactivate/discussions/SurfaceAreaTriangular/

Also, here are some videos :

Feel free to make any changes or comments on my post. Okay bye :)

Cylinder Volume and Volume Problems

Answers:

Answers:

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:

SURFACE AREA

LEARNING GAMES

What is a surface area?

The lesson we're talking about

An area of a side of a triangular prism

Area

measures combined areas of all the surfaces of a 3D shape

or View Results

Create your own poll at Flisti.com

What is the total surface of a triangular prism?

3

4

5

6

or View Results

Create your own poll at Flisti.com

*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=5.024m³

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

VOLUME VIDEO! ENJOY!:)

Homework Book Page 52-55

My scribe post includes the questions : 4 on page 53 . 2 on page 54 . 4 on page 55 .

Question 4 Page 53
Draw at least four possible nets for a cube. (Each net must fold to create a cube)

Question 2 Page 54
Find the Surface area of the 3-D object
First, you must find the dimensions of the top, front, and side. You then multiply them by each other, as shown below. After you do that, you must add the products together, giving you the total surface area of 220.6cmsquared, 3.14msquared or 451.2cmsquared



Question 4 Page 55
Find the surface area of 3-D object


Here is a link that may help you with surface area
Here is a video that may help you with surface area

How many faces does a rectangular prism have?

5

6

1

4

or View Results

Create your own poll at Flisti.com

Cylinder Volume and Volume problems

The height to the nearest centimetre is 3.13. To get to this answer, you must divide the volume of the cylinder, by the area of its base, giving you the answer-- which is the height of the cylinder.


The answer to this question is 2.826cm^3.
To get this answer, you must find the area of both of the cylinders, like so. After you find both the areas, you subtract the cylinder that is on the outside, by the cylinder in the inside. You then have your answer.

Page 180-181 Questions 3,5,7,11

Questions 3

For #3 I did 2 ways. First I did a net to make my solving easier. For the 1st way I did is multiply lxw to all sides (top,front,side). Then I added all of the answer to get my Total Surface Area or T.S.A. For the 2nd way what I did is I drawed the lateral area then I added the lengths of it example 18.5. After I added it I then multiply it 13.5 because they all share 13.5. Then I multiply the side. Lastly, I added it all to get the T.S.A what I got is 819.5cm²

Question 5

For #5 I did is I first got the 3 rectangles surface areas. Then I did the triangle's surface area. After that I added all of it to get the T.S.A. (there's a diagram but it got cut off)

Question 7

What is the total surface area?

94cm²

47cm²

94cm

56cm²

or View Results

Create your own poll at Flisti.com

For #7 Basically it gave us the surface area of all sides. So you only to multiply each of them to 2 because for example if there's a top there's a bottom. After you multiply each of those add it to get the total surface area.

Question 11

For #11 I did is because he won't be painting the bottom square it has 4 faces. I did the l x w thing to each of the cubes and then I added it to get the T.S.A or total surface area.

Here's a link to learn more
A Videos

Correct me if I made a mistake thanks!

Total Surface Area

The length of a rectangular prism are 4 cm and 8 cm and 1 cm. What is the Total Surface Area?

1st way:

L x W = A

Top: 8x1 = 8cm2

Top: 8x1 = 8cm2

Front: 8x4 = 32cm2

Front: 8x4 = 32cm2

Side: 1x4 = 4cm2

Side: 1x4 = 4cm2

T.S.A = 8 + 8 + 32 + 4 + 4 = 88cm2

The total surfce area is 88cm2

The leanths of a rectangular prism are 2 cm and 6 cm and 2 cm. What is the Total Surface Area? Use lateral area

LxW = A

2x2 = 4cm2

2x2 = 4cm2

^sides.

T.S.A = 48cm2+ 4cm2 + 4cm2 = 56cm2

Comment, if I did anything wrong or something. Thanks, byee

Volume post:

v = pixrxrxh

v = 3.14x2x2x10.5

v = 131.88