How to figure the distance around a circle given the radius or diameter?

distance around a circle = circumference of the circle


= 2*Pi*r


where , r = radius


OR


= Pi*d


where , d= diameter


Pi = 22/7 ( approx.)How to figure the distance around a circle given the radius or diameter?
use the diameter times pie(3.14) Radius is radius times pie squared


3.14D=distance 3.14 times 3.14R=distanceHow to figure the distance around a circle given the radius or diameter?
2 x pi (3.14) x radius
2*Pi*Radius





Pi=3.1415926