Give the answer to 3 significant figures. Image caption, The diameter of the circle is 12 m. The formula for the area of a circle uses the radius. The radius of the circle is half of the diameter.

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 ...