Question 1006813
One interior angle measure  is {{{180(x-2)/x}}} for any regular x-gon.  You can find that using your own investigation  and identify the pattern.  The sum of the interior angles of this x-gon will be  {{{180(x-2)}}}.


Analyzing your exercise description, n-gon is the "former" and m-gon is the "latter";  {{{system(n-m=5,180(n-2)=2*180(m-2))}}}.


Simplifying the system should give  something equivalent to {{{system(2m-n=2,n-m=5)}}}.



{{{highlight(system(n=12,m=7))}}}