Around 250 B.C., the Greek mathematician Archimedes calculated the ratio of a circle's circumference to its diameter. A precise determination of pi ... tell you that the square root of 3 is ...

The radius of the circle is 74 cm to the nearest cm. Practise pi and working out the circumference of circles with this quiz. You may need a pen and paper to help you with your answers.

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 ...