NEED HELP WITH THIS I BEEN STUCK ON IT PLZ HELP

Answer:
72
Step-by-step explanation:
2πr=72π > 2r=72 > r=36.
d=2r > d=2⋅36 > d=72.
Answer:
22.9290363057
Step-by-step explanation:
The circumference = pi × the diameter of the circle.
72= pi × the diameter
72=3.14× the diameter
72/3.14= the diameter
22.8299363057= The diameter