## Sunday, March 21, 2010

### 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