M3 · Thinker
Geometry
Perimeter and area
Formula
perimeter = sum of sides; rectangle area = l x w
Rule
Perimeter is the distance around a shape, area is the surface inside it.
Example
A 3 by 4 rectangle has area 12 and perimeter 14.
Tip
Perimeter is measured in units, area in square units.
Learn this concept
Perimeter & area