Sal Khan, of Khan Academy, solves the Perimeter of rectangle covered by 9 non-overlapping squares that is from 2000 American Invitational Math Exam. (09:56)

Derek Owens discusses how to find the perimeter of a figure. The ideas are explained and some example problems are worked through. From the pre-algebra course by Derek Owens. (02:32)

This video indicates it is for pre-algebra, however this would be good for anyone who is reviewing perimeter. This video would not be for the beginner, they use complex shaped figures. In this video they show and discuss how to find perimeter. To fin...d the perimeter you need to add up all the lengths of the figure. In this video they show how to find perimeter of odd shaped figures where some measurements are missing. Video is good quality and good for all students as review or initial learning of the concept.[more]

This slideshow was used as part of an introduction to perimeter in a third- grade measurement unit. This brief slideshow has 7 slides and is easy to understand.

From pbslearningmedia.org, produced by Thirteen/WNET New York

In this video segment from Cyberchase Inez competes in a rollerblading competition against Rimm, a skater for Team Hacker. Just before Inez skates, Hacker changes the shape of the field. It still has the same perimeter, but it is much narrower. The C...yberSquad decides to compare the perimeter and area of the three different fields they've had to skate on to make sure it is a fair competition. (4:21)[more]

From pbskids.org, produced by Thirteen/WNET New York

In this "Cyberchase" interactive game, players find out if two things with the same perimeter have different areas by creating a fleet of Cyber-spaceships using pieces of uniform length.

Finding the perimeter of a semi-circle involves a math formula that starts with C equals two Pi R. Formulate the rest of the perimeter math equation to find the circumference of a semi circle with this video.

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