## Thursday, March 18, 2010

### Riemer's Surface Area Growing Post

RECTANGULAR PRISM

FRONT: TOP: SIDE:
a=lxw a=lxw a=lxw
a=4x4 a=4x2 a=4x2
a=8cm2 a=8cm2 a=8cm2

Now since you have the caculations for each side, you need to caculate the TSA.

TSA=FRONT+FRONT+TOP+TOP+SIDE+SIDE
= 8 + 8 + 8 + 8 + 16 + 16
= 64 cm2

TRIANGULAR PRISM

a= b x h / 2
a= 7 x 5 / 2
a= 17.5 cm2

a= l x w
a= 5 x 2
a= 10 cm2

a= l x w
a= 2 x 6
a= 12 cm2

a= l x w
a= 2 x 6
a= 12 cm2

Since you have all the caculations for this rectangular prism, caculate the TSA.

TSA= 10 + 12 + 12 + 17.5 + 17.5
=69cm2

CYLINDER

C=pi x diameter
C=3.14x4
C=12.56

area=pi r2
area=3.14x2x2
area=12.56

lxw=area
12.56x12.56=area
157.75=area

Now you caculate the TSA for this cylinder. If you don't know what TSA stands for, it stands for Total Surface Area.

TSA=Circle+Circle+Rectangle
=12.56+12.56+157.75
= 182.87cm2

MR. HARBECK!! SORRY THAT I DIDN'T GET MY PICTURES AND VIDEOS ON HERE !
MY MAC WONT LET ME UPLOAD MY PICTURES ON HERE AND MY GROUP AND I DIDN'T DO OUR VIDEOS.
AM I STILL COMING TO PRACTICE AND PLEASE SAY YES !!