Answer: So, circumference equals (I’m just gonna rewrite the formula to help us follow our work), =×, equals pi times diameter. So now all we need to do is to plug in our number for diameter. This is equal to, and also we said pi is equal to 3.14, =(3.14)(9 cm)=28.26 cm.
Explanation: I think this right, if not, please let me know. :D