Question 198551
<font face="Tahoma" size=1.5>
</pre><font size=4><b>
Just by seeing the radii given, we can see the Ratio of the Circumference of the two Circles, {{{C[1]/C[2]=3cm/9cm=1/3}}}.


To show,
{{{C[1]=2(pi)r=2(pi)(3)=6pi(cm)}}}


{{{C[2]=2(pi)r=2(pi)(9)=18pi(cm)}}}



{{{C[1]/C[2]=6pi/18pi=6cross(pi)/18cross(pi)=6/18=1/3}}}


Thank you,
Jojo</font>