## Friday, March 9, 2012

### raeesa's surface area and volume post

How to find the surface area of a:
- triangular prism

- and a cylinder
-rectangular prism

Triangular Prism:
b times h divided by 2

TSA: 36+36+45+50+40
TSA: 207 cm squared

Rectangular prism:
TSA: 2(T+F+S)
TSA:2(60+50+30)
TSA: 2(140)
TSA: 280 m squared

Cylinder:

TSA: circle+circle+rectangle

TSA: 50.24+50.24+301.44
TSA= 401.92 mm squared

WEBSITES:
http://www.teacherschoice.com.au/maths_library/area%20and%20sa/area_9.htm

Volume:
To find the volume of a triangular prism you use the formula Base times Height divided by 2 times the height.
for example 6cm times 3cm dived by 2 times 13cm.you would first times 6cm by 3 cm which is 18cm then divide 18cm by 2 which is 9cm
the you would go 18 times the height which is 13 and you would get the number
234 cm cubed

Volume of a cylinder?
The formula you would use is pie r squared

Volume of a rectangular prism?
Formula length times the width times the height.

how to find out a volume with a fraction?
you would first find the volume by base times height divided by two times the height.