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Perimeter

Perimeter is the distance around a two-dimensional shape.

Example 1: the perimeter of this rectangle is 7+3+7+3 = 20

perimeter of rectangle

Example 2: the perimeter of this pentagon is 3+3+3+3+3 = 5×3 = 15

perimeter of pentagon

 

The perimeter of a circle is called the circumference: circle