Because From the Latin/Greek root Peri, comes from the word around/surround. Meter was thrown at the end of it so it would literally mean surrounding meter or length. Thus we have Perimeter =]
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The perimeter.
If the figure is 2-dimensional, it is called the perimeter.
The length of the perimeter is the circumference. The perimeter itself is the boundary between the interior and exterior of the circle. The perimeter of a circle is called the circumference
The perimeter is the distance around a figureIt is normally its perimeter
The perimeter of a circle is its circumference