The outer edge of a dime is the circumference of the dime
[tex]\begin{gathered} \text{circumference of a dime(circle) = 2}\pi r \\ =\text{ 2 x 3.14 x 8.89} \\ =56.26\text{ mm} \end{gathered}[/tex]The closest to the length of the edge from the options given is 55mm
