This video describes the concepts of perimeter and area.  

You should know how to :

• find the perimeter of any shape.  (add the length of the sides)
• find the area of a rectangle ( multiply the length and the width)  A= L X W
• a formula, such as A= L X W, is short efficient way to express the instructions to calculate a concept

There will be a thatquiz where you can practice finding the perimeter and area.