The diameter (d) is 7
Greetings
Definition. The formula for calculating the circumference is C=πdor C=2πr C = π d or C = 2 π r where d is the diameter and r is the radius.
Thus, by substituting know values to the variables
[tex]d = c \div \pi[/tex]
c= 21.98 & pi= 3.14
[tex]d = 21.98 \div 3.14 \\ d = 7[/tex]
Finally, we get the diameter 7.
Hope it helps!!
