The formula for the perimeter of a shape depends on the shape. It is the sum of the lengths of all the sides that enclose the shape.
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2(length + height)= perimeter
Square is a special case of a rectangle and the same formula may be used to find the perimeter
Perimeter = sum of the lengths of the sides.
The perimeter of a pentagon is the sum of its 5 sides
The perimeter of a triangle is the sum of its 3 sides.