Surface Area Growing Post

Heey guys!! sorry this post maybe late but I managed to finish it on time (:


The calculations for the triangular prism is
10cm , 12cm 4cm , and 5cm .


P.S - sorry if you cant read either one of these questions.



AND please correct me if you see anything wrong

Jusitn's Surface Area Growing Post

TSA of rectangular prism

The rectangular prism has rectangular faces.

So, use the formula A = lw to find the area of the faces.

For both the front and back faces, l = 5 in. and w = 2 in.

So, the area of the front and back faces is,

5 2 2 = 20 in.²

For both the top and bottom faces, l = 14 in. and w = 5 in.

So, the area of the top and bottom faces is,

14 5 2 = 140 in.²

For both the sides, l = 14 in. and w = 2 in.

So, the area of the two sides is,

14 2 2 = 56 in.²

Add the area of the faces.

20 + 140 + 56 = 216

So, the total surface area of the given solid is 216 in.².

TSA of triangular prism

The triangular prism has triangular bases.

So, to find the area of the bases, use the formula:

Substitute 6 for b and 8 for h.

Therefore, the area of the two bases is,

2(24) = 48 cm²

The triangular prism has rectangular sides.

So, use the formula A = lw to find the area of the sides.

The area of the front side is,

13 8 = 104 cm²

The area of the bottom side is,

13 10 = 130 cm²

The area of the back side is,

13 6 = 78 cm²

Find the sum of the base areas and the area of the sides.

48 + 104 + 130 + 78 = 360

So, the total surface area of the given solid is 360 cm².

TSA of a cylinder

The radius of the circular base is,

he area of a circle is, A = πr² where r is the radius.

Replace π with 3.14, r with 2.4.

A (3.14)(2.4)²

A = 18.0864

So, the area of one base is 18.0864 cm².

The sum of the areas of the two bases is,

18.0864 + 18.0864 = 36.1728 cm²

This video is on how to find the tsa of a cylinder , rectangular prism, and triangular prism. It was created by Warren, Bruce and I.

Runcel's surface area growing post

Rectangular Prism

• Draw a Rectangular Prism
• Draw its net.
• List all measurements on the drawing and on the net.
• What formulas do you use to calculate surface area?
• Calculate our the surface are of your rectangular prism.

Top
L*W=Area
7*3=Area
21 =Area


Side
L*W=Area
3*4=Area
12=Area


Front
L*W=Area
7*4=Area
28=Area

Top
L*W=Area
7*3=Area
21 =Are

Side
L*w=Area
3*4=Area
12=Area

Front
L*W=Area
7*4=Area
28=Area

TSA=21+21+12+12+28+28=272cm

Triangular Prism

• Draw a Triangular Prism
• Draw its net.
• List all measurements on the drawing and on the net.
• What formulas do you use to calculate surface area?
• Calculate our the surface are of your triangular prism.

Triangle
B*H/2
9*7/2
63/2
31.5*2
63


Rectangular prism
L*w=Area
10*5=Area
50*3=Area
150=Area

TSA=150+63=213CM

Cylinder

• Draw a Cylinder Prism
• Draw its net.
• List all measurements on the drawing and on the net.
• What formulas do you use to calculate surface area?
• Calculate our the surface are of your cylinder prism.

Area=pi*r*r
=3.14*1*1
=3.14


c=Pi*d
=3.14*2*2
=12.56


TSA=3.14*12.56=39.4

Edmil's Surface Area Growing Post

Hi Everybody!

Sorry but my Sureface Area Growing Post is late.

Surface Area Growing Post

Ayooo (:

Uhm, yea I know this is late. But my computer has been crashing every time I go on blogger but then I'm using my cousins computer now.

Here is my growing post..

Ok, I'm done. Bye (:

Surface Area Growing Post

Hello, this assignment is a growing post about the surface area of basic 3-D objects. First there is a rectangular prism with a net that contains a problem that I will solve using formulas. Then a triangular prism problem, then a cylinder, after that is two videos showing how I solved it. Before that though, I have to show and solve the three basic 3-D objects below.
This is a rectangular prism with its net (sorry the pictures are bad). A rectangular prism has two squares and four rectangles (or 6 rectangles). Now onto the problem part.

Here's the problem. I need one formula for each side of the prism. However I will do one of each type of side since I am not doing the same side again with the same calculations (makes my life easier and this post shorter). For rectangles and squares, the formula is length (L = length in short) multiplied by width (W = width). Then I am going to put the measurements in for the rectangle (any way does not matter). You can use a calculator if you want for this question (I used one too). In this problem, there are only two shapes with different measurements.

10.2 by 7.4 Rectangles

Rectangle = L x W

Rectangle = 10.2 x 7.4

Rectangle = 75.48m squared

4.7 by 7.4 Rectangles

Rectangle = L x W

Rectangle = 4.7 x 7.4

Rectangle = 34.78m squared

Now after finding all of the areas of the rectangular prism, I will add all of the areas up to get the total surface area of the rectangular prism (what I am trying to find) to finish the problem. There are four 10.2 by 7.4 rectangles and two 4.7 by 7.4 rectangles.

75.48 + 75.48 + 75.48 + 75.48 + 34.78 + 34.78 = 371.48

TSA (Total Surface Area) = 371.48m squared

The next 3-D object is an triangular prism. It has two triangles and three rectangles.

Surface Area Growing Post for Feburary 27th 2010

Surface Area Growing Post

Rectangular Prism

Formulas to calculate surface area of a rectangular prism

A of rect = (lxw) x 2

A of rect= (8x7) x2


A of rect= 112 mm2




A of rect= (lxw) x 2


A of rect= (7x4) x 2


A of rect= 56 mm2




A of rect= (lxw) x 2


A of rect= (8x4) x 2


A of rect= 64 mm2




TSA= 56+64+112


TSA= 232 mm2





Trianglular Prism




Formulas for finding the surface area of a triangular prism


A of tri= (bxh) / 2


A of tri= (4x2) / 2


A of tri= 4 mm2




A of rect= (lxw)


A of rect= (6x2)


A or rect= 12 mm2




A of rect= (lxw) x 2


A of rect= (6x 3.5) x 2


A of rect= 42 mm2





A of tri= (bxh) / 2


A of tri= (4x2) / 2


A of tri= 4 mm2




TSA= 4+42+12+4


TSA= 62 mm2




Formulas for fining the surface area of a cylinder.


R = d / 2


R= 2 / 2


R= 1 cm2








C= pi d


C= 3.14x2


C= 6.28 cm2






2x(pi x r x r ) + ( pi x b x h )


2x(3.14x 1 x 1) + ( 3.14 x 1 x 6.28 )






TSA= 3.14+19.7192


TSA= 22.8592 cm2

Surface Area Growing Post

Hello!!!!!! Alright here's a growing post dedicated to surface area!

A picture of a rectengular prism: (up there )

Rectangular Prisms

To find the surface area of a rectangular prism you have to find the area of the side, the top, and the front. multiply each of those areas by 2 and add together.
top:
lxw
12x4.5
54x2
=108

side:
lxw
10.4x4.5
46.8x2
=93.6

front
lxw
12x10.4
124.8x2
=249.6
Area:108+93.6+249.6= 451.2 cm 2






Triangular prism

To get the area of a triangular prism multiply base by height and divide by 2.That is the triangle. Now for the rectangles multiply length by width for each one, and add each of the measurement together.

(b × h) ÷ 2 = A
L × W = A
L × W = A

(2 × 2) ÷ 2 = A
5 × 3 = A
5 × 2 = A

2cm* = A
15cm* = A
10cm* = A
2cm+2cm+15cm+15cm+10cm

= 44cm

Cylinder prism

First multiply Pi by radius by radius to get the area of the circle. Then to get the area of the rectangle multiply pi by base by height. Add the answers together and you have the answer.

R= d/2

R= 5/2

R= 2.5cm

C= (pi)d

C= 3.14(5)

C= 15.7cm

(10cm)

A= lxw

A= 15x15.7

A= 235.5cm(2)

A=(pi)rr

A= 3.14x 2.5 x 2.5

A= 19.625cm(2)

Area: 19.625+19.625+235.5

Area: 274.57

R=d/2

C=(pi)d

A= lxw

A= (pi)rr

So we did a test and, Harbeck told us to take a few questions out of it and put it on the growing post.No problem.Here are 5 questions I chose.
1.3/4 x 7/8.
Times the numerator by the numerator. 3 x 7= 21.
denominator x denominator (4 x 8) = 32. 21/32.
The next question I did was q.5
5.4 7/8 x 1/7. Pretty much the same but we have to change the mixed fraction to a improper fraction.4 groups of 8 = 32. 32 + 7 = 39. 39/8.39 x 1= 39, 8x 7=56. 39/56.
The next question I did was q.7
7. 13/7 x 32/5 .Now we just have to change both numbers.1 group of 7=7. + 3 = 10.10/7.3 groups of 5 =15.+2= 17.10x17=170.7x5 =35. 170/35. Simplify. 170/35 divided by 5 = 34/7. Now we have to mix the fraction. 66/7
Then Harbeck told us to do these questions
11/2 divided by 3/4. How many times does 3/4 go into 11/2. Twice.You have to make the numbers into the most common denominator.11/2 into 12/4.3/4 goes into 11/2 Twice.
3/4 divided by 1/2. How many times does 1/2 go into 3/4. 1/2 also = 2/4.So it goes into it two thirds of the way. 1/2 goes into 3/4, 2/3 times.

Alex's surface area growing post

OK, so here are the shapes.
Rectangular Prism

I really do not know how to list the measurements of this rectangular prism but I will try to explain them as best I can.The top front line that is going horizontal is 10 cm, the bottom line on the right side is 15cm, and the line on the front right that is going vertical is 12cm.
Here is the pic or the rectangular prism (above)
Next is the net of a rectangular prism


the measurements of this are the very top line is 10 cm, the bottom line on one of the arms is 15cm, and the side of the arm and head is 12cm.
The formulas for finding the surface are of the rectangular prism are:

Surface area is the sum of the areas of all the faces of a 3-D object.
Surface Area = A1 + A2 + A3 + A4 + A5 + A6,
where A1 represents the area of rectangle 1, A2
represents the area of rectangle 2, etc.

So first I have to find the area:
lxw =a
12x10=a
120=a for a1, a2, a3, and a4
lxw=a
15x12=a
180=a
TSA=120+12o+120+120+180+180
TSA=840

Triangular prism

here is the net

Here is the formula for finding the surface area of the triangular prism and I am solving it here.
Surface area = (3 × area of rectangle) + (2 × area of triangle)
= (1 × 300) + (2 × 120) + (2 x 500)
= 300 + 240 + 1000
= 1540

Cylinder prism

The measurements are the radius of the circles are 5cm, the circumference of the circles are 12cm and the lines are22cm
Here is the net

The measurements are the radius of the circles are 5cm, the bottom line is 12cm and the only vertical lines are 22cm.
The formula's for finding the surface area of a cylinder are
The surface area of a cylinder is the sum of the
areas of its faces.
S.A. = 2 × (π × r2) + (π × d × h) or to shorten this it could be S.A.= 2πr2 + πdh
To solve it I will use the formula
S.A.=2x3.14x25 + 3.14x 10x
And last but not least...my video: