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Perimeter
The abbreviation of "perimeter" is "per." It is commonly used in mathematical contexts to represent the total distance around the outside of a shape or object. The perimeter can be calculated by adding together the lengths of all the sides of the shape.
The total distance divided by the total time equals the "Average speed" during that time.
For the perimeter of a polygon you add the sides to find the total distance around the shape. For area, you multiply using the various formulas for different polygons.
Circumference is the total distance around a circle. It's the length of the perimeter.