Answer:
1 cm
Step-by-step explanation:
We know that the formula for the circumference of a circle is [tex]2\pi r[/tex], where [tex]r[/tex] is the radius.
Because the circumference of the circle in the question is [tex]2 \pi[/tex], we have
[tex]2\pi = 2 \pi r[/tex]
So [tex]r=1[/tex] (cm).
