Question

what is the circumference of a circle when r=2.2

Answer 1

Circumference is 2(3.14)r. 2(3.14)(2.2).   (6.28)(2.2) The circumference is approximately 13.816.

Answer 2

Use 2πr
So 2π times 2.2
= 13.823008
Or 13.82(2dp)