873 Math (2009): surfacearea

Showing posts with label surfacearea. Show all posts

Friday, March 26, 2010

Krystal's Growing Post

RECTANGULAR PRISM
TOP;FRONT;SIDE

Area =LxW Area=LxW Area=LxW
Area = 5x8 Area=8x8 Area=8x8 Area =40cm2 Area=64cm2 Area=64cm2

TSA= TOP + TOP + FRONT + FRONT + SIDE + SIDE
= 40+40+64+64+64+64
= 208 cm2

TRIANGULAR PRISM

a = b x h ÷ 2

a = 10 x 12 ÷ 2

a = 60cm²

a = l x w

a = 10 x 4

a = 40cm²

a= l x w

a = 10 x 4

a = 40cm²

a= l x w

a= 10x 12

a = 60cm²

TSA

= (triangle)+(triangle)+(rectangle)+(rectangle)+(rectangle)
= 60+60+60+40+40

= 260cm²

Cylinder

Radius:

r = d ÷ 2

r = 12 ÷ 2

r = 6cm²

Formula:

sa = 2 x (pi x r²) + (pi x d x h)

sa = 2 x 3.14 x 6 x 6 + 3.14 x 6 x 12

sa = 226.08+ 226.08

sa = 452.16 cm²

Wednesday, March 24, 2010

Surface Area Growing Post

PART 1

PART 2

Sunday, March 21, 2010

Surface Area Growing Post

Rectangular Prism

Triangular Prism

Cylinder

Sorry i cant upload the video's but here the site where u can see it
http://www.ustream.tv/recorded/5208235
http://www.ustream.tv/recorded/5208364
http://www.ustream.tv/recorded/5208565

SORRY THE IT WAS LATE TOO
comment if i made some mistake

Tuesday, March 16, 2010

Surface Area growing post Richard

Rectangular prism

Cylinder

formula 2x3.14xrxrx3.14xdxh 2x3.14x3x3x3.14x6x10=10648.40

Triangular Prism

If you want to find the surface area of a triangular prism you need to find the the area of the 2 triangles and the3 squares then add all the surface area of the 2 triangles and 3 squares then you should get the total surface area.

Tuesday, March 9, 2010

Kim's Surface Area Growing Post

Surface Area Video

Monday, March 8, 2010

SURFACE AREA GROWING POST BY AMIEL

CYLINDER

TRIANGULAR PRISM

RECTANGULAR PRISM

Kaitlin's Surface area growing post

Triangular prism:

Abby's Surface Area GROWING POST (:

Kisha's Surface Area Growing Post

Rectangular Prism

Triangular Prism

Cylinder

Sorry I posted this late, its because Raquel and I worked so hard on the video, and it took like 3 hours to load onto youtube. So heres my post. And sorry if you can't really see my pictures. I did it in my notebook because it saves time from doing it in paint (:

Sunday, March 7, 2010

Surface Area Growing Post , JerickR873

Ok this is my growing post for math , i will be showing yo what a rectangular prism , triangular prism , and a cylinder looks like and nets , also how to solve for Total Surface Area (TSA)

1st the Rectangular Prism

the formula for the rectangular prism is:
l x w = a

one way to find TSA for a rectangle is to find the area of the side , front , and top then you just times those by two because of their opposite side

Top

l x w = a
20 x 2 =a
40x2=ax2
80=ax2

Side
l x w = a
20 x 2 = a
40 x 2 = ax2
80 = a x 2

Front

l x w = a
20 x 20 = a
400 x 2 = a x2
800 = a x2

TSA = 800+80+80
TSA= 960 cm2

2nd is the Triangular Prism

Formula
b x h = a
l x w = a
I like to find all sides just like the rectangular prism and add up all the sides

Front
b x h = a
12 x 12 = a
144 x 2=a
288 = a x2

Bottom
l x w = a
12 x 5 = a
60 = a

Back
l x w = a
12 x 5 = a
60 = a

Top
l x w = a
1o x 5 = a
50 = a

TSA= 50 +60 + 60 + 288
TSA= 458 cm2

3rd the Cylinder

Formulas
d divided by 2 = r
pi R 2 = a
pi D = c
l x w = a

For cylinders , you need to find the area and circumference of a circle and times that by 2 , for the other end , and then for the rectangle its the circumference of the circle that is the width of the rectangle

pi D = C
3.14 x 15 = c
47.1 = c

d/2 = r
15/2=r
7.5= r

pi R 2 = a
3.14 x 7.5(2) = a
3.14 x 56.26 = a
176.67 x 2 = a
353.34= a

l x w = a
20 x 47.1 = a
942=a

942 + 353.54 =1295.34 cm2

Thanks YOU FOR READING MY POST

PLEASE COMMENT ON ANYTHING THAT I DID WRONG OR
THINGS I CAN DO BETTER

GROWING POST

SO, Everyone did there growing post with using paint and such. But, I just took pictures cause, I didn't feel like doing it on paint or where ever. So, here are my pictures.(:

Rectangular Prism:

Triangular Prism:

Cylinder:

THERE, If you can't read it.. then, CLICK THE PICTURE. :D It should be big enough. Thanks, for looking at my post. COMMENT.