Area is the size that a surface takes up, measured in square units.

Area of a rectangle = length times width

Area of a square = side times side (s2)

Area of a triangle = one half times base times height (1/2bh)

Area of a trapezoid = base one plus base 2 divided by 2 times the height

Area of a circle = pi times radius times radius (π • r2)

Perimeter is the distance around the outside of a shape. To find the perimeter, add the measure of all of the sides.

Circumference is the distance around a circle. The circumference of a circle = pi times diameter (π • d).

 

Related Books

(courtesy of Illinois Institute of Technology, www.iit.edu/~smile)

An Introduction to Volume by Linda James Woods, Harold Washington Elementary School

Measurement of Volume by Richard Murray, Gage Park High School

Volume and Surface Area by Charlotte Goldwater, Kenwood Academy

An Introduction to Area and Perimeter by Edwina R. Justice, Gunsaulus Scholastic Academy

An Introduction to Estimation and Measurements by Christeen Brown, Robert Fulton Elementary

Circumferences, Diameters, and Radii by Dwayne Belle, Fuller School

 

 

Web Resources

Area and Perimeter
http://www.mathleague.com/help/geometry/
area.htm

Challenge Exercises (work the problems online)
http://www.mathgoodies.com/lessons/vol1/
challenge_vol1.html

Constant Perimeter and Constant Area Rectangles
http://www.edc.org/MLT/ConnGeo/CP.html

Interactive Geometry Area and Perimeter
http://www.mathplayground.com/
InteractiveGeometry.html

Perimeter and Area of Polygons (lesson plans)
http://www.mathgoodies.com/lessons/
toc_vol1.html

Shape Surveyor
http://www.funbrain.com/poly/index.html

Using Area and Perimeter to Design a Fun House
http://its.guilford.k12.nc.us/webquests/
areaperim/areaperim.htm