147۰994907 ÷ 2 =73۰99745385. 148۰0140971 ÷ 2 =74۰00704854. The radius of the circle is 74 cm to the nearest cm. Practise pi and working out the circumference of circles with this quiz.

It is defined as the ratio of a circle's circumference to its diameter. It was first discovered by Archimedes around 250 BC and he approximated its value up to seven digits. Pi Day was observed on ...