Area of Polygons

Area- measured using square units.  The area of a region is the number of nonoverlapping square units that cover the region.  A square foot has 1 foot on each side, denoted as 1 ft squared.

I.  Area on Geoboard

Addition Method- finding the sum of the smaller areas
Rectangle Method- construct a rectangle around the shape then subtract the shaded part


II.  Converting Units of Area

III.  Area of Rectangle

Area = length x width

IV.  Area of a Parallelogram

Area = base x height

V.  Area of a Triangle

Area = 1/2 x b x h or (b x h)/2

VI.  Area of Trapezoid

Area = 1/2 x (base1 + base2) x height

VII.  Area of Circle

Just for fun here is a very awesome way to remember to remember  the formulas for the area of a circle and the circumference!


Cheery Pie Delicious
 C = pi x diameter

Apple Pies Are Too