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A perimeter is a path that surrounds an area. The word comes from the Greek peri (around) and meter(measure). The term may be used either for the path or its length - it can be thought of as the length of the outline of a shape. The perimeter of a circular area is called circumference.
The perimeter of a triangle is the sum of its 3 sides
well there is many different types mm, cm, m, km,
The distance around the outside.
Square is a special case of a rectangle and the same formula may be used to find the perimeter