## Monday, April 14, 2008

### Kate's BOB

Finding the Surface Area of a Rectangular Prism

To find out the Surface area of a Rectangular Prism the first thing you have to do is make your object into a net so it looks like this:

(Surface Area : Surface area is the measure of how much exposed area an object has)

After Laying out your Rectangular Prism into a net you have to find the area of each shape. So to find the surface area of the whole object you have to find the area of each shape and add them together like this:

The Front and back Area = 8 x 4 = 32 cm ²
The Sides Area = 8 x 4 = 32 cm ²
The Bottom and the Top Area = 4 x 2 = 8 cm ²

Then you multiply each one by two becuase there are two of the same shape. It makes things easier.

32 x 2 = 64
32 x 2 = 64
8 x 2 = 16

Then you add all of those up and that gives you your surface area!

64 + 64 + 16 = 144 cm ²

Finding the Volume of a Rectangular Prism

To find the Volume of a Rectangular Prism is quit simple all you got to do is follow this formula:

Length x Width x Height = Volume

(Definition of Volume: The amount of space, measured in cubic units, that an object or substance occupies)

Now all you got to do is plunk in your numbers and do the math

Height x Length x Width = Volume
10 cm x 6 cm x 4 cm = 240 cm ³
(Since it is a three dimensional object we put cubed or ³)

Thats all you have to do :)