The circumference is the perimeter of a circle. It is a length and so is measured in \(mm\), \(cm\), \(m\) or \(km\). An area is measured in square units: \(mm^{2 ...

A circular shape or object is one that is in the form of a circle ... of a straight line from the centre of the circle to its circumference. All radii of a circle are the same length.