March12,2012
Aim: How do we calculate the area of rectangles and triangle?


To find the area we first  need to know what area is .
AREA is the amount of surface that a shape contains.


RECTANGLE:

Area (rectangle) or  Area (rectangle) = (length)•(width) B:base      H: height

The rectangle has two formulas of a triangle and either formulas can give the correct area of a rectangle.


For example :  

In the image to the left the rectangle has a base of 5cm and a height of 10 cm.
To find the are we first 
multiply : 5 x 10 
which gives us 50 and since its in centimeter, our final answer is 50cm2




TRIANGLE:
Formula for the area of the triangle :

B: BASE 

H: Height

For Example :

                 

In the image above we have a base of  5 cm and a height of 6cm. First :

Multiply 6and 5 to give us 30.

THEN :

Divide 30 by 2 giving us an answer of 15.

FINALLY:

Use 15 and have the proper units.

The answer for the triangle would be 

15CM2

NOW TRY THIS :D

 FIND THE AREA OF THE RECTANGLE BELOW.

SOURCES:

For the image of the rectangle and more areas go to : http://www.regentsprep.org/Regents/math/ALGEBRA/AS1/RefARea.htm 

The picture of the "now try this " was taken by:

 http://www.google.com/imgres?hl=en&biw=1440&bih=742&gbv=2&tbm=isch&tbnid=hTTL5Vh5Ah4VtM:&imgrefurl=http://ed101.bu.edu/StudentDoc/current/ED101fa10/alliero/content%25203.html&docid=-nMWyZZgSX4ypM&imgurl=http://ed101.bu.edu/StudentDoc/current/ED101fa10/alliero/Images/rectangle%252520area.jpg&w=330&h=257&ei=MStmT8mMB4fX0QGLq7C3CA&zoom=1&iact=hc&vpx=215&vpy=239&dur=2935&hovh=198&hovw=254&tx=147&ty=81&sig=107129537430957669125&page=1&tbnh=162&tbnw=208&start=0&ndsp=16&ved=1t:429,r:11,s:0 

My brain :D