# Define or Explain Perimeter in Mathematics. Or What is Perimeter ?

The perimeter is defined as the length of the outline of a shape or It is the distance around the outside of a shape.

To calculate the perimeter of a square or a rectangle we have to add the lengths of all the four sides. Let's assume 'a' is the length of the rectangle while 'b' is the width of the rectangle. The perimeter P is:
P = a + a + b + b    OR

P = 2(a + b)

In case of square as all side are equal, so assume a is the length of each side. So perimeter is :

P = a + a + a + a     OR

P = 4(a)

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