1. Lesson 3: They Key to Perimeter and Area
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2. The Key to Perimeter and Area
Perimeter is the distance around a figure or region. Notice the word rim in perimeter. Remember that perimeter is the measure of the rim of a figure. Area is the number of squares of a given size that cover a surface. It is the surface included inside a perimeter. Notice that the last three letters in a square are in area.
The Key to Perimeter and Area

3. Rule: To find the area (A) of a rectangle, multiply the length by the width. A = l x w

4. Rule: To find perimeter (P) of a rectangle, add the length (l) and width (w), then multiply by 2. P = 2(l + w)
PERIMETER