Area is measured in square units. On a centimetre grid each square measures 1 cm by 1 cm. Each square has an area of one square centimetre, 1 cm². The area of the square is the side-length ...

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 ...