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If you wanted to redecorate your house, you would need to know how much carpet, paint or wallpaper you would need - you would use area and perimeter to work this out.
The lengths of the base and the side. You would multiply these to get the area and would double sum of the two to obtain the perimeter measurement.
you need length and width length multiply width = area length + length + width + width = perimeter
The lengths of each of its sides.
Perimeter is used when you want to find the length of the sides of an object. A practicle use for perimeter would be knowing how much fencing you need to enclose a certain amount of space, but the length of the fencing would be the perimeter.