Cylinder Homework

. represent multiplied(x)

2.π.r.r + 2.π.r.h ( is the formula for solving this equation )

cylinder 1. 2.π.r.r + 2.π.r.h ( FORMULA )
2. 3.14 .3 .3 + 2 3.14 .3 .5 =
56.52 + 94.2 =
150.72cm²

cylinder 2. 2.π.r.r + 2.π.r.h ( FORMULA )

2. 3.14 .4 .4 + 2.3.14 . 4. 15 =
100.48 + 380=
477.28²


http://www.mathsteacher.com.au/year9/ch14_measurement/15_total/cylinder.htmu/year9/ch14_measurement/15_total/cylinder.htm

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:

Tonie's Volume Scribe Post

Volume

Base (of a prism or cylinder)

• any face of a prism that shows the named shape of the prism
  
• the base of a rectagular prism is any face
  
• the base of a triangular prism is a triangular face
  
• the base of a cylinder is a circular face

Height (of a prism or cylinder)

• the perpendicular distance between the two bases of a prisms of cylinder

Volume

• the ammount of space an object occupies
  
• measured in cubic units

Orientation

• the different position of an object formed by translating, rotating, or reflecting the object

Volume of a Rectangle Prism

l x w x h

6x5=30cm^2
30cm2 x 10 = 300cm^3

Volume of a Triangular Prism

b x h/2 x h

5x7/2=17.5cm2

17.5cm2 x 10 = 175cm3

Volume of a Cylinder

d/2=r

8/2=r
4cm=r

3.14.r.r.h
3.14.4.4=50.24cm2
50.24cm2 x 10 =502.4cm3

Here are some videos to help you guys out (:

Here are some links to help you out more!! (:
link1
link2

link3

Answer:

Jumbo Container:
d/2=r
20/2=r
10=r

V=pi.r.r.h
V=(3.14 .10 .10) .40
V= 314.40
V=12,560 cm^3

Popcorn Lover's Container
d/2=r
30/2=r
15=r

V=pi.r.r.h
V=(3.14.15.15).40
V= 706.2 . 40
V=28,248cm^3

Martha should buy the 'Popcorn Lover's' container because the volume is bigger.

Answers:

*please feel free to correct me*

Cylinder Homework

r= d/2

r=7/2

r=3.5cm

=2 .π. r. r+ 2.π.r.h

=2. 3.14 . 3.5 . 3.5+2 . 3.14 . 3.5 . 7

= 76.93 + 153.86

= 230.79cm 2

r=d/2

r=15/2

r=7.5cm

=2 .π. r. r+ 2.π.r.h

=2 . 3.14 . 7.5 . 7.5 + 2 . 3.14 . 7.5 . 18

=353.25 + 847.8

=1201.05cm 2

=2 .π. r. r+ 2.π.r.h

=2 . 3.14 . 6.5 . 6.5 + 2 . 3.14 . 6.5 . 20

=265.33 + 816.4

=1081.73cm 2

A link to about cylinders:

http://mathcentral.uregina.ca/QQ/database/QQ.09.03/kathryn1.html

r= d/2
r=8/2
r=4m

v=( r x r) x h
v=(3.14 x 4 x 4) x 10v=50.24m 2 x 10
v= 502.4m 3

502.4/2
=251.2m 3

Then you subtract the volume of the smaller cylinder to the bigger cylinder which will give you the amount of concrete needed for the culvert.

Concrete= 5.024m 3 - 7.85m 3

Concrete= 2.826m 3

Marie's Volume Post

Things to remember:

• The bases are circles
• Radius is half a diameter
• Diameter cuts a circle in half
• Circumference is the perimeter of a circle
• Pi is the ratio between circumference/diameter or 3.14

Formulas:
Circumference - pi (d) = c
Radius - d/2 = r
Diameter - 2r = d or c/pi

Area of a circle:
pi (r²) or pi (r) (r)

Net of a cylinder:

Formula:
lxw = a
pi (r) (r) = a
d = 2r
r = d/2
c = pi(d)

Here are the answers on our homework.
*I'm only showing one of each (diameter, circumference, radius) because Mr. Harbeck told me to.*

Here is a link on cylinders.

A video to help you learn the surface area of a cylinder:

Cylinder Volume and Volume Problems


7.3

7.4

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: