Answer:
[tex]56.52\text{ mm}[/tex]
Step-by-step explanation:
The circumference of a circle with radius [tex]r[/tex] is given by [tex]A=2r\pi[/tex].
We're given a radius of 9 mm and told to use [tex]\pi=3.14[/tex]. Substituting these values, we get:
[tex]A=2(9)(3.14),\\A=\boxed{56.52\text{ mm}}[/tex]
