The length of the total boundary of a figure is called its perimeter. The Metric unit of perimeter is same as the unit of length - Metre.
The perimeter of 2D geometrical figures like square or rectangle can be obtained by calculating the sum of all the sides of the figure.
The amount of surface covered by an object is called it area. The Metric unit of area is square metre.
Lesson on Perimeter and Area
Learnhive Lesson on Perimeter and Area