Question

Work out the circumferance of the circle, using pie as 3.14, and radius as 3cm

Answer 1

C=2πr in this case and using the approximation...

C=2(3.14)3=18.84cm (note 22/7 is a much better approximation and is just as easy to use :))

Answer 2

The Circumference of a circle is 2PiR or PiD.
3.14 x 3 x 2
3.14 x 6
18.84 is your answer.