873 Math (2009): surface area

Showing posts with label surface area. Show all posts

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.