The distance around the outside.
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The perimeter of a triangle is the sum of its 3 sides
well there is many different types mm, cm, m, km,
Square is a special case of a rectangle and the same formula may be used to find the perimeter
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.
Circumference is only used for circles. Perimeter is for every other 2D shape.