Question 1085285


The circumference of a circle is found using this formula:

{{{C=pi*d}}} where {{{d=diameter}}}
or
{{{C=2pi*r}}} where {{{r=radius}}}

you are given  diameter {{{d=4cm}}}, so use

{{{C=pi*d}}} 

{{{C=3.14*4cm}}} 

{{{C=12.56cm}}}