Area and perimeter
The area of a plane figure is the space enclosed by that figure. Area is also the measure of the enclosed space. It is typically expressed in square units. To find the area of plane figures:
The term perimeter commonly refers to the distance around a shape or figure. It is also the name for the outer edge of said figure or shape. Below are some examples of perimeter:
Note that circumference, the distance around a circle, is a special kind of perimeter that is specific to circles.