The perimeter is the distance around a region, measured in suitable units of length
The perimeter of a circle has its own special name, the circumference
here is is and abundance of examples of perimeter
https://www.google.ca/search?q=perimeter&es_sm=119&tbm=isch&tbo=u&source=univ&sa=X&ved=0CE8QsARqFQoTCIeQuoL7-McCFUcUkgodBloEFg&biw=1605&bih=858
what is perimeter
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