What is Perimeter and circumference is measured in?

Answer 1

Basically, perimeter and circumference mean the same thing. They are the measurement of a boundary, be it a large field or a small circle drawn on a piece of paper. Usually, the measurement is either in yards, feet and inches (showing my age here!) or, nowadays, due to metrification, in metres and centimetres.

Answer 2

Both are linear measures and may be measured in millimetres, centimetres, metres, kilometres etc, depending on the size of the object being measured.