Question

Need help with one question about circumferences and circles...PLEASE HELP!!!

Answer 1

the ratio for the first is : r1/r2=r1\[\frac{ r1 }{ r2}=\frac{ r1\sqrt{2} }{ r2? }\]

Answer 2

\[=\frac{ r1\sqrt{2} }{r2\sqrt{2} }\]

Answer 3

and the second is....\[\frac{ circle1 }{ circle2 }=\frac{ 2\Pi r }{ ?2\Pi r }\]