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If you are adding tiles to any side of a figure, then you are increasing its total surfgace area and, of course, the distance around the figure ( perimeter) is also increased.
It is the total length "outline" of a figure. For example, the total length of the outline of a square, its perimeter, is the total length of the four sides of the square.
The 'perimeter' of any closed figure drawn on paper means the total distance around it. If the figure consists of straight lines, then the perimeter is the sum of the lengths of all the straight-line pieces. If you set an ant down at a certain point on the figure and he started walking along the line, the perimeter is the distance he would have to walk in order to wind up at the point where he started.
Perimeter is a term that describes the total length of a 2-dimensional figure. It is usually the distance that you would need to travel to go all the way around an object and get back to your starting point. The number of feet in it will depend on how big it is. A postage stamp will have a perimeter of around 10 centimetres, a field may have a perimeter of several kilometres.
Volume is the amount of liquid a container can hold. Perimeter is the length of the borders outside a 2D figure. Area is the total space in a 2D shape.