3/12/12 Aim: How do we Calculate the Area of Rectangles snd Triangles?

How do we Calculate the Area of Rectangles snd Triangles?

Area

- The are of a plane figure is the measure of the region endosed by the figure. 

- You can measure the area of a figure by counting the number of square units that are arranged to completely fill the figure

Triangles

- The area of a triangle is given by the formula : A= 1/2bh 

- ' b' in the formula represents the base of the triangles

- 'h' in the formula represents the hieght of the triangle

Example: In the example below the line 'BD' inside the triangle in represents the height of the triangle an line ' AC' represent the base

Example question :

A= 31.5

H= 7 

B= ?

Rectangles ( parallelograms)

- Have two pair of parallel sides

-  Use the formula A= bh to find the area

- ' B' represents the base

- 'H' represents the height

 Example:

Example Question : 

B= 10

H= 5

A= ?

Work citations

Math planet , http://www.mathplanet.com/education/geometry/right-triangles-and-trigonometry/mean-and-geometry , Spring 2011

Pierce, Rod. "About The Ads" Math Is Fun. Ed. Rod Pierce. 7 Aug 2011. 19 Mar 2012 <http://www.mathsisfun.com/about-ads.html>